Because if this is how our brains really worked, then chatgpt wouldn't be beating most humans at standardized tests and then failing this absurdly easy question that even an elementary school kid could pass.
It is simply regurgitating this phrase without even considering that it is stating the exact opposite of the answer it just gave, simply because most answers to this riddle on the internet say this at the end.
> This riddle plays on the assumption that a surgeon is typically male, but in this case, the surgeon is the boy's mother.
So from this 1 failing, you can see that it is a copy and paste machine, and it doesn't even understand that it is contradicting itself.