I don’t think someone winning a game they’re not supposed is adequate proof of cheating. It’s not like chess tournaments don’t take a lot of precautions against cheating either.
In the game in question, it was the "deep" moves and the speed in which he was making them that drew suspicion.
Kinda like me asking you what 237 x 4178 equals and giving little thought, you immediately give me the correct answer.
And the fact that Niemann has admitted to cheating in on line tournaments in the past certainly doesn't help his case.
Carlsen needs to channel his inner Johnny Cochrane. “If I get beat. He must be a cheat.”
Proof isn’t required in the mind game surrounding the world of competitive Chess. After becoming World Champion, Bobby Fisher never got another match, just the way he wanted. So he and the World Chess Federation quit having anything to do with each other. He didn’t cheat, but the international crowd of grand masters, couldn’t stand playing against him. They would become sick during matches with him. Fisher Fever is what they called it. He wasn’t making them sick, but they were worrying themselves sick because of how he played.