[umanwizard]

But standard programs like Stockfish won’t tell you how strong a move was. They’ll just tell you how much it changes the evaluation.

E.g. if you initiate a queen trade in a straightforward position, on the next move I have to take back my queen; any other move will show a gigantic evaluation drop by the engine. But that doesn’t mean it’s a particular strong move — even an absolute beginner will play it. Thus it’s of no value for determining whether the person who played it is cheating.

It’s entirely possible that chess.com has access to more sophisticated software that can estimate the strength of players (they sort of allude to this with their “strength score” metric) but AFAIK it’s not publicly available and not clear how it works, or whether it can evaluate individual moves as opposed to the game as a whole.

[Nomentatus]

I think it's more a question of whether, given more time to calculate, the software changes it's choice of move to something else.