Sorry but I can't take the article seriously. The notion that everybody can simply be divided into either being an "Extrovert" or "Introvert" is very doubtful for me.
Even if you accept this one dimensional personality description as being useful by itself;
- is it constant (the same in all circumstances),
- does it vary over time?
- Is everyone either an "introvert" or an "extrovert" OR do people fit on a sliding scale between the two extremes?
I'm guessing that the author feels he is an introvert. IMO, rather than trying to redefine or clarify what it means to be an "introvert" just don't accept the "introvert/Extrovert" labels. Its a pseudo-scientific term which is used in a lazy way to put people into neat boxes.
I'll bet most people can think of situations where they will act "extroverted" and others where they'll be "introverted".
We are neither a number or a label!