The spreadsheet in your screenshot says that the user NataDoka on the bitcointalk.org forum had the Twitter username sergeyuf.
I tried searching for posts by the user on the forum: https://bitcointalk.org/index.php?action=profile%3bu=1817936%3bsa=showPosts. None of the posts mentioned the username sergeyuf, but many posts mentioned the Twitter username dokadnepr75. One post said "Twitter username:@dokadnepr75" which was followed by the line "Twitter URL: https://twitter.com/Sergey15585539". It may have been a mistake, because the post was formatted using a similar formula as other posts but in other posts the field for the Twitter URL showed the URL of dokadnepr75. And the username Sergey15585539 was not mentioned in other posts.
Twitter says that the account Sergey15585539 is suspended, so it's not the same account as anticatlady. It wasn't archived by the Wayback Machine. Old replies to the account seem to be related to cryptocurrencies: https://x.com/search?q=%40Sergey15585539&f=live. But on the other hand old replies to sergeyuf seemed to be related to sports: https://x.com/search?q=%40sergeyuf&f=live. So I don't know if the account sergeyuf was actually used to promote cryptocurrencies, because none of the replies to the account seem to be related to cryptocurrencies.
The account dokadnepr75 still exists, and it has about 3,000 tweets but they mostly seem to promote cryptocurrencies or Web3 projects, and the newest tweet is from 2018. The display name of the account is "Наталья Доленко" and its location is set as Ukraine, and its profile picture is a photo of two ladies.
The user NataDoka on the bitcointalk.org forum also posted many links to their Facebook profile, which has the display name Наталья Доленко and a photo of the other lady who is featured in the profile picture of the Twitter user dokadnepr75: https://www.facebook.com/NataDoka. She has liked many pages related to cryptocurrencies on Facebook.
In 2022 she posted a photo of someone named Sergei in Ukrainian military gear and wrote this in Ukrainian: "Please help to find her!!!! Sergei Igorovich Grigorovich 10/24/1984 н. Lives in the m. Chernivtsi Military man. Last time I came in touch on 10.03.2022 at 6:00 am, was in the Kyiv region" (https://www.facebook.com/NataDoka/posts/pfbid02RDQXrjVDLCe3Q28J9ALZGqPFQk7QdbPfZwLCP1FVjx3n2V9upvUE9HtmPjFB9wbtl). I don't know if it's the same Sergei though.
When I googled for `site:bitcointalk.org Sergey15585539`, I found many posts by a user whose username on the forum was zxcsk1983. However the year of birth of the Sergei that NataDoka mentioned on Facebook was 1984. And actually her post wasn't even an original post but a repost from some other user. So I guess it was a different person.
There's also a Twitter account with the username zxcsk1983 and the display name "Sandra Flower". It was registered in 2018 and it stopped tweeting in 2019, and it mostly tweeted about cryptocurrencies: https://x.com/search?q=from%3Azxcsk1983&src=typed_query&f=live. The account has only 5 tweets posted in 2018, which are a tweet that says "Привет, Twitter! # myfirstTweet" and 4 photos of some lady who is holding a flower, one of which is also the profile picture of the account (so I don't know if the account is portrayed as the lady in the photos): https://x.com/search?q=from%3Azxcsk1983+until%3A2018-12-31&f=live. There's also a Facebook account which has the same username and display name, which has posted the same photos of the lady holding the flower, and which promoted cryptocurrencies: https://www.facebook.com/zxcsk1983.
The Google spreadsheet in your screenshot says that a Bitcointalk user with the Twitter username Siwaadi75 had the username zxcsk1983 on Telegram. But the Twitter account has been suspended and the profile of the user has also been deleted from the Bitcointalk forum. (So I guess it's possible that 1983 was not the real year of birth of the Sergei who posted on the Bitcointalk forum either, and Sergei was not necessarily even his real name.)
In the spreadsheet the email address of Siwaadi75 is shown as AlielIvdQ@gmail.com. When I googled for the email address, I found another similar spreadsheet titled "Coal Coin Airdrop - Round 1 (Responses)", where the email address was used by someone whose username was enJCartey on the Bitcointalk forum, NShovkoplyase on Twitter, and guru99yase on Telegram: https://docs.google.com/spreadsheets/d/1Q2We1_7grCtAn33lVjtM3aGiUmmousc94fSDbMSwQFM.
The same spreadsheet featured a row for someone whose username was icollega53 on the Bitcointalk forum, Siwaadi75i on Twitter, zxcsk1983i on Telegram, whose email was MarvendiyaCielahanali@gmail.com, and whose ERC-20 address was 0x21fDA261FADA17A8935A6ACB4F1826b2C4d5A12a. The Twitter accounts NShovkoplyase and Siwaadi75i no longer existed, and I didn't even find any replies to the accounts.
In the spreadsheet in your screenshot titled "GoldMint Bounty Campaign", the Bitcointalk user NataDoka with the username sergeyuf on Twitter had the Ethereum address 0xAFF837fb63189e1751011E35421565DAfD098E86: https://docs.google.com/spreadsheets/d/17VrwXPGx_laLk81OV6p-565Ai3kO06QswmiZAIt4DRs. When I googled for the address, I found another spreadsheet titled "fidentiaX Bounty Program Spreadsheet (all in one)", where the same Ethereum address was listed on a row for the Bitcointalk user deadser whose username was eslibatak at Twitter: https://docs.google.com/spreadsheets/d/1DH-MS3WI62DOEoQ7nQorillZGc6dp7qZ1E-peCdA-yk. Most of the posts by the user at Bitcointalk were written in Indonesian: https://bitcointalk.org/index.php?action=profile%3bu=1145977%3bsa=showPosts. But the Twitter user had a Turkish display name and it posted in Turkish. And I don't think it's a different user either, because it had a lot of tweets about cryptocurrencies and it had posted with the same username from 2011 until 2023.
What method do you use to find the old usernames of accounts like this whose old tweets have been deleted?
It varies. Sometimes the old tags are still present in replies to the account, other times the permanent ID turns up somewhere searchable.
The spreadsheet in your screenshot says that the user NataDoka on the bitcointalk.org forum had the Twitter username sergeyuf.
I tried searching for posts by the user on the forum: https://bitcointalk.org/index.php?action=profile%3bu=1817936%3bsa=showPosts. None of the posts mentioned the username sergeyuf, but many posts mentioned the Twitter username dokadnepr75. One post said "Twitter username:@dokadnepr75" which was followed by the line "Twitter URL: https://twitter.com/Sergey15585539". It may have been a mistake, because the post was formatted using a similar formula as other posts but in other posts the field for the Twitter URL showed the URL of dokadnepr75. And the username Sergey15585539 was not mentioned in other posts.
Twitter says that the account Sergey15585539 is suspended, so it's not the same account as anticatlady. It wasn't archived by the Wayback Machine. Old replies to the account seem to be related to cryptocurrencies: https://x.com/search?q=%40Sergey15585539&f=live. But on the other hand old replies to sergeyuf seemed to be related to sports: https://x.com/search?q=%40sergeyuf&f=live. So I don't know if the account sergeyuf was actually used to promote cryptocurrencies, because none of the replies to the account seem to be related to cryptocurrencies.
The account dokadnepr75 still exists, and it has about 3,000 tweets but they mostly seem to promote cryptocurrencies or Web3 projects, and the newest tweet is from 2018. The display name of the account is "Наталья Доленко" and its location is set as Ukraine, and its profile picture is a photo of two ladies.
The user NataDoka on the bitcointalk.org forum also posted many links to their Facebook profile, which has the display name Наталья Доленко and a photo of the other lady who is featured in the profile picture of the Twitter user dokadnepr75: https://www.facebook.com/NataDoka. She has liked many pages related to cryptocurrencies on Facebook.
In 2022 she posted a photo of someone named Sergei in Ukrainian military gear and wrote this in Ukrainian: "Please help to find her!!!! Sergei Igorovich Grigorovich 10/24/1984 н. Lives in the m. Chernivtsi Military man. Last time I came in touch on 10.03.2022 at 6:00 am, was in the Kyiv region" (https://www.facebook.com/NataDoka/posts/pfbid02RDQXrjVDLCe3Q28J9ALZGqPFQk7QdbPfZwLCP1FVjx3n2V9upvUE9HtmPjFB9wbtl). I don't know if it's the same Sergei though.
When I googled for `site:bitcointalk.org Sergey15585539`, I found many posts by a user whose username on the forum was zxcsk1983. However the year of birth of the Sergei that NataDoka mentioned on Facebook was 1984. And actually her post wasn't even an original post but a repost from some other user. So I guess it was a different person.
There's also a Twitter account with the username zxcsk1983 and the display name "Sandra Flower". It was registered in 2018 and it stopped tweeting in 2019, and it mostly tweeted about cryptocurrencies: https://x.com/search?q=from%3Azxcsk1983&src=typed_query&f=live. The account has only 5 tweets posted in 2018, which are a tweet that says "Привет, Twitter! # myfirstTweet" and 4 photos of some lady who is holding a flower, one of which is also the profile picture of the account (so I don't know if the account is portrayed as the lady in the photos): https://x.com/search?q=from%3Azxcsk1983+until%3A2018-12-31&f=live. There's also a Facebook account which has the same username and display name, which has posted the same photos of the lady holding the flower, and which promoted cryptocurrencies: https://www.facebook.com/zxcsk1983.
The Google spreadsheet in your screenshot says that a Bitcointalk user with the Twitter username Siwaadi75 had the username zxcsk1983 on Telegram. But the Twitter account has been suspended and the profile of the user has also been deleted from the Bitcointalk forum. (So I guess it's possible that 1983 was not the real year of birth of the Sergei who posted on the Bitcointalk forum either, and Sergei was not necessarily even his real name.)
In the spreadsheet the email address of Siwaadi75 is shown as AlielIvdQ@gmail.com. When I googled for the email address, I found another similar spreadsheet titled "Coal Coin Airdrop - Round 1 (Responses)", where the email address was used by someone whose username was enJCartey on the Bitcointalk forum, NShovkoplyase on Twitter, and guru99yase on Telegram: https://docs.google.com/spreadsheets/d/1Q2We1_7grCtAn33lVjtM3aGiUmmousc94fSDbMSwQFM.
The same spreadsheet featured a row for someone whose username was icollega53 on the Bitcointalk forum, Siwaadi75i on Twitter, zxcsk1983i on Telegram, whose email was MarvendiyaCielahanali@gmail.com, and whose ERC-20 address was 0x21fDA261FADA17A8935A6ACB4F1826b2C4d5A12a. The Twitter accounts NShovkoplyase and Siwaadi75i no longer existed, and I didn't even find any replies to the accounts.
When I googled for the ERC-20 address, I found a third spreadsheet where the same address was used by someone hose username was icollega53 on the Bitcointalk forum and zxcsk1983i on Telegram: https://docs.google.com/spreadsheets/d/1VPWJLG5zYk8VBGWoqHOpvy9peIFfzGx1AdE05g1fss0.
In the spreadsheet in your screenshot titled "GoldMint Bounty Campaign", the Bitcointalk user NataDoka with the username sergeyuf on Twitter had the Ethereum address 0xAFF837fb63189e1751011E35421565DAfD098E86: https://docs.google.com/spreadsheets/d/17VrwXPGx_laLk81OV6p-565Ai3kO06QswmiZAIt4DRs. When I googled for the address, I found another spreadsheet titled "fidentiaX Bounty Program Spreadsheet (all in one)", where the same Ethereum address was listed on a row for the Bitcointalk user deadser whose username was eslibatak at Twitter: https://docs.google.com/spreadsheets/d/1DH-MS3WI62DOEoQ7nQorillZGc6dp7qZ1E-peCdA-yk. Most of the posts by the user at Bitcointalk were written in Indonesian: https://bitcointalk.org/index.php?action=profile%3bu=1145977%3bsa=showPosts. But the Twitter user had a Turkish display name and it posted in Turkish. And I don't think it's a different user either, because it had a lot of tweets about cryptocurrencies and it had posted with the same username from 2011 until 2023.
Imagining what you could do with a budget and a large team. Great work.