This piece is fatuous. Alexander perpetuates the "women like people, men like things" trope that is common to every message board discussion of CS gender disparity. He then explains away the fact that women excel in science fields by saying "what do women do with math degrees? They become teachers." He ignores that the effect remains in graduate-level math studies (women do not get math PhD's to become high school teachers) and in other STEM fields (women do not get biochem masters to become high school teachers).

He's contrived a just-so story that appeals to his audience. Which is par for his course.