The "sin" he committed was playing no stakes online blitz, and you are projecting this 'mark' on his reputation to a professional over the board tournament with

The "sin" he committed was playing no stakes online blitz, and you are projecting this 'mark' on his reputation to a professional over the board tournament with anticheating measures. The tournament organisers were very confident that no cheating took place at the event. To me it is a rather closed case. Regarding Carlsen's behavior, so far it looks like he has grown a very big ego. Not interested in a second championship match with Nepo, throwing tantrums against an up and coming player who defeated him. Maybe he's feeling he is losing his edge against a new generation of players, and doesn't like it.