This can be true or not depending on job.

But the point is valid: what the linked article is pointing out is the motion toward a more extrovert-oriented educational philosophy. The truth is that classical education has always been designed for the introvert: students were required to sit quietly at their desks, wait to be questioned, do work in silence, etc...

And the truth is that some students (the extroverts) do comparatively poorly in this environment. So we're retooling to better serve them, potentially at the expense of the ones who were already well-served.

I don't know that this is an easy problem, but it's certainly more complicated than "introverts are discriminated against in school".