Her responses also failed to address the fact that one of the co-founders resigned.
So at the end of the day we have someone spewing vitriol; and someone stepping down from a prestigious position as a show of good faith. That's the only evidence I have and it doesn't reflect well on Julie at all; I can only imagine what it's like to work with a person who spits out expletives at that cadence.
What I imagine happened is some guy at work had a crush on her and made an awkward pass at her. Maybe he tried to smell her hair or something, I don't know. She shot him down, then he got all butthurt and started undoing her commits on the projects they worked on together. Because they were painful reminders of her.
From his perspective, he's a sensitive guy who just got rejected and isn't coping well. But to her, he's the guy deleting her code because she wouldn't fuck him.
That doesn't seem crazy at all to me. It seems totally possible, and just the kind of situation competent HR departments are supposed to prevent and mitigate.
(I am speaking in general and totally not referring to any specifics of the situation here.)
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.