My opponent has 400 elo and is playing at 98% accuracy. Is he cheating?

If you suspect am opponent of using disallowed resources, you should report them, but not post in the forums about it.
https://support.chess.com/article/209-how-do-i-report-someone
As mentioned, short games can have high accuracy anyway.
That said, discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums.
My opponent has 400 elo and is playing at 98% accuracy. Is he cheating?