I dislike the blog post for being poorly written but one of the author's points is that it's too late to attack diversity during recruiting because your pool of women applicants will already be tiny due to attrition. She is advocating approaching women in college but at you point out, even that's way too late. You can't have a society that instills shitty values into people from their first breath and then expect to undo all those years of mindfuckery because you work at a progressive place and are really passionate about diversity.