It's rapidly turning into science fact, unless you've been living under a rock the last year.

Science fiction or not, saying this person's opinion matters more because they have a better understanding of how it works is like saying automotive engineers should be considered experts on all social policy regarding automobiles.

Also it's not "rapidly turning into fact". There are still massive unsolved problems with AGI.

I think the guy running the company that's got the closest to AGI, one of the top experts in his field, knows more about what the dangers are, yes. Especially if they have something even scarier that they're not telling people.

There is no secret hidden "scary" AGI hidden in their basement. Also, speculating at the "damage" true AGI can cause is not that difficult and does not require a phd in ML.

How would we know? They sat on GPT4 for 8 months.