The purpose of the article is to refute the claim that "women get paid significantly less for the same work as men". It does not try to prove that there is no discrimination in hiring or promoting. Most people think that the pay gap is as simple as managers deciding to pay women less, which is wildly inaccurate and nearly never happens, as the article shows. It is up for debate what has the larger impact on what jobs women take and how far they advance: their personal preferences or discrimination.