It should also be mentioned that general statements or studies about the relative mathematical or technical abilities of men and women do not necessarily have any direct bearing on specific groups of men and women, like “people who have successfully completed a STEM PhD”. In fact, it’s quite plausible that any differences between men and women disappear once you only look at those people who have a PhD, even if those differences did exist in the general population (which is debatable, and even if it is true, it is not clear which factors are responsible for it). Since this article talks about gender disparity in the population of people who have a PhD, statements or studies which apply to the general population are not really all that relevant.