Spot on.
The article rants, for example, that extrovert behaviours tend to be extrapolated to leadership skills. I think perhaps instead, leadership requires basic people skills which come naturally to “extroverts”. Being able to look someone in the eye instead of their navel (or worse) is a basic requirement.
But beyond that people skills are skills that most people can learn and be successful leaders.
I’d go as far as say, with experienced managers, it can be hard to tell if they are introverts or extroverts. They are good at directing teams using a variety of means of communication, during paid hours. Not bubbly chatterboxes or addicted to WoW or whatever cliche you want to use.