The site doesn't use Game Review accuracy as a cheat detection mechanism and most players are going to get between 70-90% in many games:
https://support.chess.com/article/1135-what-is-accuracy-in-analysis-how-is-it-measured
However, if you really feel that any opponent used disallowed resources, you should report them directly:
https://support.chess.com/article/209-how-do-i-report-someone
[public accusations not allowed -- MS] é o nick do meliante
95% + de precisao em varios jogos recentes com apenas 550 de rating por favor ajudem a derrubar esse cara denunciem ele por trapaça obg!