Why is this being dressed up as introvertedness v. extrovertedness? Introvertedness and extrovertedness are different directions on a scale, not absolute point

Why is this being dressed up as introvertedness v. extrovertedness? Introvertedness and extrovertedness are different directions on a scale, not absolute points. Introvertedness covers a far milder set of characteristics than those described here. What the author describes is an extremity of the spectrum and characteristics more usually associated with Asberger or High functioning Autism.