This article resonates very much with my experience.
I don't think it's really about introversion vs extroversion, but more about the implications of feeling emotionally isolated and stuck in a cycle of isolation. Being an introvert doesn't imply this kind of isolation, and being an extrovert doesn't prevent it.
It's hard to say how well an article of this length can summarize and express the extent of his theory, but I found it intriguing enough that I bought the book.