It's not an obscure trivia question. It's a question that anyone with an understanding of the material in question should be able to answer, with something vastly better than a superficial 'the two books are similar, but, like, different and talk about different stuff'.

It immediately cuts to the heart of the matter - an LLM does not understand things. It does not know anything but which word follows another. It can't do anything but regurgitate things it has read in an incredibly lossy manner.

But it's a neat party trick that seems to fool a lot of people into thinking that there's something legitimately useful, here.