> then the beholder is trusting not just the correctness of that one sentence but all of the experiences and insights from the author.

This implies they know the author and can trust them. If they don't know the author then there is no trust to break and they are only relying on the collective intelligence which could be reflected by the AI.

That is to say that trusting a known human author is very different from trusting any human author and trusting any human author is not that much different from trusting an AI.