Because it doesn’t have any understanding of the rules of chess or even an internal model of the game state, it just has the text of chess games in its training data and can reproduce the notation, but nothing to prevent it from making illegal moves, trying to move or capture pieces that don’t exist, incorrectly declaring check/checkmate, or any number of nonsensical things.

As a guy with long hair, I’ve learned to just roll my eyes at the gendering of hair products. The all in one shit is made with the assumption that it’s being used on short hair that’ll be chopped off in a few months max, so it doesn’t need to preserve anything. Long hair has to last years.