https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com
https://www.chess.com/article/view/online-chess-cheating
Accuracy on a single game doesn't normally mean very much and accuracy, as implemented by the site, is not a good cheat detection method.
That said, discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums. If you want to discuss, join the following club. https://www.chess.com/club/cheating-forum
aint no way dude, is he cheating