Yes, when you reach a certain level - any plays which do not conform to the "best practices" of the day, will look highly suspicious. In poker, when you're play

Yes, when you reach a certain level - any plays which do not conform to the "best practices" of the day, will look highly suspicious. In poker, when you're playing at the top level, against top level people, it is assumed that all players on the table know things like GTO, etc. When people start to deviate from stuff like that, it is either assumed that the player is cheating, or a complete beginner. Same with chess. When top players start making really weird moves, they're either getting computer assistance - or they've made a nonsensical move. And for people that seemingly never do nonsensical moves, it is easy to conclude that they must be cheating. It is actually not too different from video game speed runs. The margins are so small, and all the top level players know every move. Discovering new stuff can take years - so if a newcomer suddenly starts making waves, beating seasoned pros left and right with seemingly genius strategies - is he a genius, or cheating? Most in the community will go for the latter.