Yes, extroverts can have high IQs.
While it's true that introversion is observed more frequently within high IQ populations, the capacity for high intelligence is not exclusive to introverts. The reference material clearly states: "Both introverted and extroverted children can have high IQ" (07-Mar-2018). This indicates that personality type (extroversion or introversion) doesn't limit intellectual potential. The distribution may be skewed, but extroverts are certainly capable of achieving high scores on IQ tests.
