Magnus has not said he’s suspicious,other people have. If anything Magnus behaves if he actually thinks he’s beating him fairly. If he thought he was cheating why would he pull out after one move.?
It was a qualifying game.
Carlsen will ace out the other games and qualify.
My guess - he is showing contempt for Niemann.
Out loud.
Obviously he thinks there’s cheating. He’s boycotting Niemann!