It reads like "first person to follow the account" itself.

But this is also why deleting this stuff only benefits the criminals. Unless the guy is still controlling his own Twitter, this would be TwitX or unsavory bureaucrats. But something tells me the former has a bit more on his plate right now than covering up Twitter.

Quick edit: But I'm not sure that Twitter is sorting in (reverse) chronological order -- and the API does not make the order publicly available from what I can find from searching.

It doesn't even strictly matter if they were the first or last follower or anything in between, that's a really weird person to be following some semi-random guy on Twitter.

It reads like "first person to follow the account" itself.

But this is also why deleting this stuff only benefits the criminals. Unless the guy is still controlling his own Twitter, this would be TwitX or unsavory bureaucrats. But something tells me the former has a bit more on his plate right now than covering up Twitter.