Which we know they did, in spades, in other contexts; but I've seen no evidence in the "Twitter files" to indicate anything illegal was going on in this context. The government briefed Twitter that they expected disinformation campaigns and to be on the lookout for them. The government also flagged a bunch of tweets as "hey, these are sus and might violate your rules, you ought to take a look" like anyone else can do.
Whatever Musk and Taibbi are trying to cook up, they seem to have forgotten who was running the federal government at the time. It wasn't Joe Biden or tHe LiBeRaLs. The whole thing is stupid.