[Viliam1234]

He wrote it badly, because his goal is to write something controversial, which will remind people of his existence and hopefully increase the books sales. The target audience are people who are already his fans, and will accept uncritically anything he writes.

It is possible to have a reasonable debate about whether intelligence is real, what exactly it means, and what outcomes it correlates with. This is obviously not the way to do it. This is pure clickbait, pretending to be smart math, because pictures with dots and number, plus textbook screenshots.

Some of the things he says make sense. But he exaggerates their importance, and completely strawmans his opposition. "If you want to detect how someone fares at [X], make him/her do that task; we don’t need theoretical exams" - thank you, Captain Obvious!