People have been caught cheating in the past.
Chess cheating is not black magic.
Chess engines are an integral part of the Chess world now, players a training with them, to analyze and prepare. I would not be surprised if many players tried to "enhance" their rating online with such an engine.
Chess.com probably has stats about this behavior.
My gut feeling is that online cheating is very common, and thus, saying that someone was caught cheating online is not a very strong proof that he also did it over the board.
Chess engines are an integral part of the Chess world now, players a training with them, to analyze and prepare. I would not be surprised if many players tried to "enhance" their rating online with such an engine.
Chess.com probably has stats about this behavior.
My gut feeling is that online cheating is very common, and thus, saying that someone was caught cheating online is not a very strong proof that he also did it over the board.