Not about the subjects they research. That is the purpose of research.
> are full of scorn for academia in general
All of those people are academics par execellance. I'm not talking about business-ified institutional academica. I'm talking about spending a long time on a topic, researching it and thinking deeply, clearly on it before you offer your opinion as though it were valuable.
> do a SPECIFIC critique of what he wrote somewhere
I have on one of his essays, but I took it seriously to write that critique.
The audience I would be targeting in a critique of the man (via a critique of his under-informed rants) are those who equate money with success and "money-making" with intelligence. I value my time too much to spend the amount required undoing that confusion.