What are the odds.....
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If you were to take an average, sub-1300 player and have them play 100 games against equally rated random opponents, with each game consisting of 25+ moves. What do you think the odds would be of that player having a game:
25+ perfect
0 good
0 inaccuracies
0 mistakes
0 blunders
You have to define those categories. Chess.com quick analysis only gives those dumbed-down categories for casual players who know nothing about engines as something to grasp. That's a fact, and I'm saying that as someone who knows a little more than nothing about engines.
If you want to investigate your opponent for cheating, you have to be much more intricate than that.
However, if "perfect" was defined as either #1 or #2 choice of the engine (assuming both very close) then I'd say it's rather conclusive.
While the OP doesn't specifically discuss cheating, it is implied, and post #2 is certainly about it, so locking.
Chess.com takes cheating very seriously:
https://www.chess.com/article/view/chess-com-fair-play-and-cheat-detection
https://support.chess.com/customer/en/portal/articles/1444879-fair-play-on-chess-com-what-you-need-to-know
Discussions of cheating, potential cheating or cheat detection are not allowed on the general forums. If you would like to have that discussion, join the following group.
https://www.chess.com/club/cheating-forum