The government was asking for tweets to be taken down, that violates the first amendment. People were being "flagged" and/or shadow banned for what they said on Twitter because the government didn't like it.
The government of course claimed it was fighting "disinformation" which is irrelevant - the 1st amendment protects all speech, true or not.
Then to add on top they were banning "disinformation" that was actually true, just politically inconvenient.
The old Twitter management was generally happy to play along since they're all on the same team, and hey "what's a constitutional right between friends"?
This was captured in emails and texts between government agencies (FBI, etc) and Twitter employees. Musk happily released it all when he bought X.
None of this is contested. How anyone can see that and say "yeah, that hack Taibi" is frankly shocking. He's one of the few journalists who actually bothered to report on it.