I'm not going to bother giving all the background on this. What I find really surprising is the number of articles coming out this morning which claim the manifesto-writer was correct - that women are more neurotic, less able to handle stress, less able to negotiate and lead, and less driven, and not as good with numbers as men. Apparently this is based in science and a good reason why we should not expect as many of them in the tech sector. If you don't agree you are just denying objective fact, and part of the witch hunt.
As for what is really going on: