You do ultimately need to trust some sources to some degree. You can try to cross-correlate multiple sources (and this is in general a good habit!), but that depends on some level of trustworthiness in the sources you are looking at, you're not at all immune to misinformation by doing this (especially if multiple sources are, undisclosed, being generated from the same LLM. You can also get citenogenesis even pre-LLMs). And of course for some things it's possible to try to verify directly yourself, but this is infeasible to do for everything you depend on.