Not exactly. Chess GMs have a somewhat "over-fitted gut." On studies done on their memory, they could routinely recall a chess board after seeing that board for only a few moments provided that the layout the pieces could be reached in a regular game. When the board was laid out in an unlikely manner, they performed no better than the control group.[1]

Let's say you arrive home with your 2y/o child and are greeted with dog shit on the floor. If I asked the 2y/o who shat on the floor they wouldn't be able to answer, but you could easily deduce that the dog did it. Why? Because you have an immense bank of experience concerning everyday causality that the 2y/o doesn't have.

Magnus has a bank of human chess moves in his mind, that we don't. He knows that the dog shat on the floor.

And keep in mind that Magnus has not thrown this accusation around in the past, even in the face of defeat.

[1]: https://www.scientificamerican.com/article/brain-study-shows...