This pseudo-intellectual doubt in the face of overwhelming scientific consensus is pathetic and part of the problem. What is the goal? Laying breadcumbs for climate-change deniers to follow to some trap for the gullible?
But it's not their job to convince him. They're the ones who have spent their lives studying this. And they're convinced. The number of people with the education and expertise who are convinced far outnumber those who even claim the same level of education and expertise who are not convinced.
And this has been true for at least 30 years.
So he could have done a better job on the retraction.
> He should have said instead "I didn't know what I was talking about".
This would have been ideal, yes.
He hasn’t spent nearly the effort trying to correct his mistake that he spent making it.