"They probably don’t realize that the marginal rate of energy cost is fast approaching zero. That technological innovation is exponential and carbon capture can likely be made economical relatively soon."
Two wildly optimistic statements that can be characterized as "the model" he's criticizing in the rest of the article.
I agree that bit is wildly optimistic, but its still not a claim that climate change is not real and it does not really change his main points that they are idiots.
I think a bigger problem in the context of the article is that they are not intellectuals.
> They probably don’t realize that the marginal rate of energy cost is fast approaching zero. That technological innovation is exponential and carbon capture can likely be made economical relatively soon.
By adding that, he is implying "Don't need to act, keep burning fossils, tech will fix it". That is in itself asserting a simplified model assumption about a (human) world that is much more complex; something he was railing against in the previous parts of his text.
Either it's a cheeky joke, he himself is an intellectual or both.
That is very different from a claim that climate change is not happening or not anthropogenic.