[TheOtherHobbes]

I'm asking for concrete evidence that his opinions have predictive power which has been assessed independently.

If no such evidence exists then all we have is just-so story-telling, which can be discounted.

The fact that a lot of people seem to believe his ideas are convincing is irrelevant to this discussion.

People believe all kinds of things because they sound plausible to them - partly because other people have made careers out of working out how to push people's "This sounds plausible so I shall believe it" buttons.

Which is why reproducible evidence and independent peer review are things. And why it's absolutely reasonable - in fact required - to question assertions that can't be grounded in them.