I was mostly referring to the top comment. If you need to write an essay on Hamlet, the book can in fact not lie, because the entire exercise is to read the book and write about the contents of it.

But in general, you are right. (Which is why it is proper journalistic procedure to talk to multiple experts about a topic you write about. Also a good article does not present a forgone conclusion, but instead let's readers form their own opinion on a topic by providing the necessary context and facts without the author's judgement. LLMs as a one-stop-shop do not provide this and are less reliable than listening to a single expert would be)