These aren't myths. This is the author attempting to redefine the meaning of the word "introvert". For example:
Myth #2 – Introverts are shy.
From dictionary.com:
noun: 1. a shy person.
http://dictionary.reference.com/browse/introvert
If you want to use the word "introvert" to support some psychological theory, that's fine. Just don't act like everyone else has been misusing the word all along.