What if a Lower Rated Player Cheats occassionally?

Hi everyone,

I recently played a game against Trippy444 (600-rated), and something felt off. Here’s the game link: https://www.chess.com/analysis/game/live/142759922040/review

Why I’m suspicious:

The opponent made moves that were almost always top engine choices, which is very unusual for a 600-rated player.
Moves were played super quickly, about every 3–4 seconds, even in positions that normally require calculation.
Some tactical sequences were executed perfectly (like 20...Qxd4 21.Nxe4), which seems almost impossible at this rating.
There were still some mistakes, which makes me think they might have used assistance occasionally, rather than the whole game.
Has anyone else experienced something like this? How does Chess.com usually handle cases where a lower-rated player might cheat intermittently?

My username: ROOKriar