I'm assuming that's been there for a while since this was topical six months ago.
Anyway, while I am no fan of Musk or the site formerly known as Twitter, I think this is a bad thing. The author's political views have been prioritised over users' abilities to use the site; even if someone wanted to monitor X users in a way lib.rs approved of they couldn't get help from the site to do this.
I think lib.rs has pulled stunts like this before, which is why crates.rs is usually recommended instead.