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Another factor to consider is that strong GM's will play main lines against strong opponents, but may deliberately play weaker lines against weaker players in order to get them out of book. Thus bad moves may end up with very good stats. I believe you can see the opponent's average rating in explorers like chesstempo's or in Chessbase the program.
Yeah nice! I didn't think of that. Thanks for the sources too
Just to clarify, it is the performance rating of a move in Chesstempo or Chessbase which tells you if it's just some GM racking up easy points versus weak opponents.
@wayne_thomas OK no worries