He made specific predictions about what problems AI would cause, not just a vague "AI will be dangerous". Those specific predictions were entirely incorrect; they both said that things would happen that didn't, and failed to foresee any of the actual problems with AI that have happened.

Well, I don't agree AI is dangerous, at least no more dangerous than electricity or the Internet. But even so, saying that AI is dangerous is not at all an original or interesting thought, especially for a guy who started talking about it in the early 2000s. Go back and watch 2001: A Space Odyssey (1968) or The Terminator (1984).