Magnus gave an interview where he said that he "hopes to be able to say more on Sunday after the tournament". My guess is the same as Nakamura's guess, he was threatened with legal action and that's the reason he cannot say much at the moment. His reference to Maxim Dlugy is also very interesting. People who know Magnus agree that he is a guy with strong principles. If Magnus believes someone is cheating he will not stop with the accusation. That's also the reason he refused to play against Niemann.
As for cheaters in general, if the last ~20years of online gaming or sports in general have taught me anything, it's that cheaters will always cheat. I am the same as Magnus, not worth my time. Dude is filthy rich and does what he is absolutely obsessed with as a job. No need to bother.
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