Heyting is somehow able to make cogent points while still being so completely un-self-aware that they believe the different sections of the gre are necessarily calibrated to be equally difficult, despite the entire conversation--the crux of the argument--being incompatible conceptions of "difficulty" across fields.
The initial point was "more people score perfectly on the math portion than on the other sections," which, as I pointed out, doesn't suggest that math is an easier field, whatsoever. Maybe the math gre is easier than the other sections. Maybe they're similar, but because there's less luck, correctness across questions within test-takers is more highly correlated.
But none of that does anything to diminish the initial complaint about advancement in the humanities academe being a lot of politicking and zero-sum political games. This isn't to say that history, as a field of study, is "harder" than physics. What would that mean? It does make the allegation that success in the academic field will, in the absence of rigor, be achieved through a lot of luck and manoeuvering that taints a lot of the output, which ends up being bullshit.
But even if the gre chart above had anything to do with anything, it's still not a persuasive chart from simple selection bias alone. The smartest physics students have tech firms, hedge funds, and consulting gigs clamoring over them. The smartest philosophy students could probably get many of the same interviews, but aren't as aggressively recruited, unless things have changed quite a bit in the last ten years. I would absolutely expect the segment of Philosophy concentrators who take the gre to be selected differently than the, e.g., CS folks.
But even if that's not the case, even if the conversation we were having was "who's smarter," and even if GRE scores were a solid metric for that, and even if there weren't selection bias there, well, they seem pretty interleaved between the two categories. So it's still an unimpressive chart to use.
I really don't know what they were thinking. If I had to guess, I guess they were thinking [unbridled rage at dipshit evo for trolling them], which, like, fair enough, I would too. But that shouldn't mean they get a pass on making a bad argument.