I'm not sure I'd find it that reassuring if "there is at least one" human cancer expert etc etc. That's part of the fallacy. One expert wouldn't give me too much additional confidence vs a super powerful medical AI. If we want to go the "reassurance by human" route, I think I'd appreciate if a significantly large group of experts understood it. But he didn't use this argument because we don't even have that in Math, where some proofs are validated by a tiny group of experts.

But if we really want reassurance, I'd want to see drug trial data reviewed by the machine and a group of clinical trial experts.