https://www.chess.com/article/view/who-was-the-best-world-ch...
Beyond that, time is a very important factor, running out the clock is one of the most effective ways to win against cheating opponents. Magnus only finds the top move ~85% of the time and takes probably 10x to 100x the time to do it. And like the other commenter noted, variance in the move time is an extremely obvious tell. Magnus will blitz out certain moves (even in classical chess) and then think for ~40 minutes in other complicated positions. A computer can do both positions in basically the same amount of time, and cheating players typically don't know when they "should" be thinking vs. playing fast.
I also think this is his classical games, not rapid, blitz, or bullet.
Top human players tend to make safer, lower variance moves than things engines prove super safe on evaluation. They may give up a few centipawns for ease of analysis.