[Elhana]

I guess when doing prep work, you analyze most of the top moves computer would suggest, so simply stealing it won't help that much, unless you really missed something. You'd need to find some move/line that your opponent has not prepared, analyze it deeper than he did and hope that actual game goes exactly as planned to implement it. The deeper it goes into a game - less chances you end up with that position on the board.

Also accusing someone should be backed by some kind of proof. Even a subpar player with some luck might memorize something a computer would suggest and implement it, despite that it is way over his expected level, yet not getting actual suggestions during a game. Is that cheating?

There are lots of videos on youtube like "This trap will help you win lots of games", that 600 elo player can memorize and then get labeled as cheater, coz it's way over his elo level.

Next step would be to ponder whether computer assisted prep in general is cheating or not, really.