Questioning the introvert/extrovert dichotomy rarely goes well on Hacker News or on any tech discussion forum, so it's a somewhat unusual that you are not being downvoted hard (even though it's a small part of your point).
He didn't question the dichotomy. Quite the opposite--"Theres obviously a lot to learn from archetypal human behavior." Alternatively, depending on what was meant by archetypal, he at least didn't contradict it.
He was simply saying that its relevance has been exaggerated and twisted. And that's, frankly, difficult to disagree with. The introversion-extroversion dichotomy has been turned into a popular psychology vehicle. But you can't judge the vehicle by the absurd places people take it.
In any event, like most such dichotomies, it's implicitly understood to be a generalization, and generalizations are not suitable for describing or predicting more specific behaviors.
He was simply saying that its relevance has been exaggerated and twisted. And that's, frankly, difficult to disagree with. The introversion-extroversion dichotomy has been turned into a popular psychology vehicle. But you can't judge the vehicle by the absurd places people take it.
In any event, like most such dichotomies, it's implicitly understood to be a generalization, and generalizations are not suitable for describing or predicting more specific behaviors.