Earlier quoted context omitted.
Even Karpov said he played badly in the Sinquefield game. Personally I think Hans didn't cheat in this game ...... but: my best theory is that Carlsen is afraid to play against people who HAVE cheated once, because there mere thought that he COULD be cheating right now is enough to derail him from clear thinking. I think this because it's exactly what he declared in an interview ABOUT cheating on 2021. So basically h…
So why even begin the match? The story would hold a lot more water if he boycotts from the outset
Like in your preparation you make an opening move and see what move the engine makes in response. Now do this in your live game and see if the opponent made the very same move. If they do, this confirms cheating. In this case may be that's the first he would do given he already suspects cheating?