No matter how accurate, GPT can't fake domain names. You can still determine where information came from. So, as it has always been, you decide which sources you trust. You get information from a particular website, and it turns out to be true and works out for your needs, so you trust it in the future. Whether the information on that site is from humans or from AI is not material.
The situation is not different from now. Humans have been faking information from the beginning of time. The only difference is scale. Perhaps this will be a good thing, as fakery was limited enough to slip through the cracks, but now everyone will be forced to maintain a critical eye, and verify sources and provenance.
The situation is not different from now. Humans have been faking information from the beginning of time. The only difference is scale. Perhaps this will be a good thing, as fakery was limited enough to slip through the cracks, but now everyone will be forced to maintain a critical eye, and verify sources and provenance.