But if you’re not an expert, it’s more likely that everything will just sound legit.

Oh, absolutely! In my field, the answers made up by an LLM might sound even more legit than the accurate and well-researched ones written by humans. In legal matters, clumsy language is often the result of facts being complex and not wanting to make any mistakes. It is much easier to come up with elegant-sounding answers when they don't have to be true, and that is what LLMs are generally good at.