In my opinion, the lack of women in tech starts far earlier, when at Christmas the boys hog the playstation, or at school the turtle and BBC micro, so the girls wander off and lose interest and never go back.
I thought that's his point - he got all these opportunities early on, which girls don't get, that's where tech privilege starts. By the time they get to college and beyond, boys have already had goodness knows how many more hours of experience, so not only are they generally better as a result (through experience rather than aptitude.)
I think women still have to prove themselves more than men do. I am biased, though. I am currently having a disagreement at work (where I'm a unix sys admin) because exceeding the performance of my peers is apparently still not good enough. I'm not sure if it's gender bias or personal bias. I've also had someone tell me the reason I can think logically is because I don't have enough female hormones. I think that my department can be particularly bad, which affects my view on things, but the figures for women in tech suggest things are currently getting worse, not better.