The real reason is that 1100 players are ranked ~1600 on Lichess. There's a good site that compares FIDE ratings, Lichess ratings, and Chess.com ratings. Lichess is inflated by many hundred points on the low end. Chess.com is more accurate. They converge towards the upper end of the human rating range.
I think the reason is that if you pick the most likely move for a 1100 player on every move, they would be a 1600 player.
Let’s say you accidentally leave a pawn hanging and 90% of 1100 players would spot it, and 10% of the time they miss it. In this engine, as the 90% is the most likely move it spots it 100% of the time.
So this example shows that if you pick the most likely move for a 1100 player every move, you end up scoring better than a 1100 player. Of course it works the other way too on spotting brilliant moves that others miss, but I guess at 1100 level play there are more opportunities to mess up!
