AI beaten by a <chess-board> Web Component

I submitted my Stack Overflow Challenges "cipher" entry

https://stackoverflow-challenges.github.io/cipher/index.html

The cipher is about black rook moves creating a Letter pattern on a chessboard. White pieces can not be captured.

Can you see what pixelated letter is on this board?

ChatGPT: What squares can the black rooks goto? Then what is the pixelated letter? White pieces can not be captured

it... eventually... comes up with the wrong answer:

Clear for every human:

AI is cool, but it ain't intelligent