My exact impression too. The article set off some alarm bells in me - it feels tad too lightweight on actual evidence of misconduct, and too rich repetitively making the same emotional points. Could be explained entirely by the author writing it in justifiable anger. Or it could be because they're trying to blow a few situations out of proportion.
I've seen plenty of posts like this landing on HN over the years, and it's not always a given the accused party is in the wrong. While my first instinct is obviously to believe the author, I'm withholding judgement until more details are clear.
EDIT:
I keep in mind an old HN drama about AirBnB, I'll try to look up details and edit them in - but what I remember to this day is, there was an angry post vilifying AirBnB, the commenters believed it fully and became very angry. As I recall, pg himself jumped in to defend AirBnB, only to be booed out. I also recall being convinced the company is strongly in the wrong. Then it turned out the situation was entirely opposite, AirBnB was in the right. I felt really stupid for jumping the gun, not waiting for full story to come out.
(And then, of course, AirBnB turned out to be a socially destructive company, so I don't like them anyway - but for different, and better thought out reasons.)
EDIT2: The AirBnB story I refer to happened in 2011, when a blogger described an extremely bad experience with AirBnB, causing one hell of a shitstorm in general startup sphere (with plenty of big names and news outlets getting involved). There was way too much written about this on HN for me to find what was the resolution now - skimming quickly I'm no longer sure which side was proven to be guilty of what. But I do recall the feeling of first being so sure in outrage, and then ashamed after discovering the story is way more complicated than what it seemed at first.