I'd be with you on this one, but his ban is coming off an announcement they are banning vaccine misinformation as well as all the last posts even on Twitter are relating to the vaccine.
The Republican leaders haven't exactly been beacons of scientific accuracy and review in this emergency. So it lines up, that one would also get caught in a widespread new policy banning vaccine disinformation.
What was being said that is verifiably false and causes tremendous harm to people?
I don't know, and YouTube won't say. They just say that "something" was wrong, but not what was wrong.