What accuracy would you consider suspicious?
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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 isn't a good metric for cheat detection in general; see the video in the second link.
That said, discussions about cheating, potential cheating, or cheat detection are not allowed in the general forums. If you would like to discuss join the following club: https://www.chess.com/club/cheating-forum