Not really ableist, just means someone who’s an absolute genius in one specific field but of mediocre intellect in all others.

My problem with the term here is that’s not what Nordhaus is in this context. He’s not a brilliant man out of his element, he’s intentionally crafting smoke and mirrors to rationalizing the continued cooking of the planet as a good thing. He’s obscuring the truth in order give the hands that feed him cover to keep up the status quo in their favor.