It's hard to quantify the smell of crazy, but we can start with an overwhelming interest in insulting the other party, and the claims stretch credibility. For example, consider the claim that a man "bullied [her] out of our code base because I wouldn't fuck him". This is a very strong statement and it seems unrealistic that investigators, lawyers, and other people within Github would come forward with "no evidence" of such things happening. On the other hand, it's the sort of thing you would say to appeal to the Internet social-justice-warrior crowd. Even the phrasing smells like something you'd read on Tumblr or a r/shitredditsays comment thread.
I don't think I can make a strong inference about what actually happened, but I would not treat this whole kerfuffle as a useful source of information about gender issues in technology--except that this is another example how powerful accusations concerning touchy issues can be, even when there is "no evidence" for them.