Re: I just don't buy it.
Perhaps, but I didn't get the sense from the book that EH started out to be awful. I got the sense that she genuinely believed she could, and was, changing the world. I think she got carried away with her own press and that brickbat Silicon Valley mentality that "impossible is just an opinion".
More, she then put herself in a tight corner via the slow dripping of real-world design and test problems with the blood machines, which then led to the false statements, lies, mis-directions and threats to cover or hush them all up.
Balwani on the other hand has been repeatedly proven as a serial liar and does read like a nasty and rotten fruit loop.