Earlier quoted context omitted.
This may be true in other cases, but not here. Hinton literally wrote the paper on backpropagation, the way that modern neural networks are trained. He won the Turing award for a reason.
Hinton was critical for the development of ai. But was he critical for the development of openai , the company? Loads of startups get eminent people on their boards largely for advertising.
The fact that he never said anything before and the fact that he's saying something now means two things in my mind:
1. He is noticing something different about the current iteration of AI technology. We crossed some threshold.
2. Hinton is being honest.