I think you missed the point. The author is a person who designs user interfaces. He knows that he can look up how to do what he wants to do by referring to material outside of the device. His interest, though, is designing user interfaces that don't require that.

Fair enough, I'm just saying that maybe the fact that he's a UI designer is what caused him to approach it in a way that most people don't. I've seen people who know less-than-nothing about interfaces (aka, your average person) get it without any help... And I'd say that is evidenced on a larger scale by the positive reviews and general success of the product.