That is also a broader epistemological question one could ask about truth on the internet or even truth in general. You have to interrogate reality

That's certainly true, but I think it's also true that you have more contextual information about the trustworthiness of what you're reading when you pick up a book, magazine, or load a website.

As a simple example, LLMs will happily incorporate "facts" learned from marketing material into it's knowledgebase and then regurgitate it as part of a summary on the topic.