I just realized I misread what you said, so that wasn't entirely relevant to what you said but I think it still stands so ig I won't delete it.

But I asked both GPT3.5 and GPT4 to give me Harry Potter with the names and words changed, and they can't do that either. I can't speak for all models, but I can at least say the two owned by the people this thread was about won't do that.