Ok, this thread is very uninformative indeed, but I feel bad that a nice contributor might be getting banned for wrong reason. And I don't even know him.
I'll tell what I've noticed. In this tournament that he played in, a couple days ago, every computer analysis seems to give 0 inaccuracies, 0 mistakes, 0 blunders, which is clearly not what happened in the games.
Anyway, I don't know if there's a way to know why exactly a person is marked as an engine abuser, what game(s) it was, etc. I find it very frustrating if there's no way. But I trust lichess.
I'm only sharing what might possibly be related to that.
Edit: I hadn't noticed this thread before making one under "feedback", related to his ban and this tournament. I had yet seen nobody talk about it. Maybe I'm just being stupid though. So help me know.