The grandparent comment does not equate intelligence and introversion.
Extroversion = median IQ and Introverted = gifted.
This article is about a particular combination of Introversion and High IQ. It is one combination of many.
Obviously it's possible to be a different combination: Extrovert + High IQ, Introvert + Low IQ, etc. I did not mean to imply, in any way, that Introversion is correlated with IQ, much less axiomatically correlated with high IQ.