Did you read the actual article? Regarding the CEO sanctioning it, it says: "It was classic P.R. jujitsu—absorbing the language of dissent to neutralize it."
The main bitterness is pretty clearly directed at Google's handling of internal sexism and sexual misconduct, culminating at what seems to be pretty direct (but underhanded) retaliation at the organizers of the walkout during a time when they gathered sustained internal and external publicity, leading to her immediate departure. Are you claiming the real spark of that conflict was her "being bitter at the people around her due to being unable to maintain relevancy" and not any real convictions she held regarding the known misconduct at the company? Seems like a dubious accusation to me in that case.
I didn't get that vibe from this piece at all. Claire sounds disillusioned more than she sounds bitter, and I really don't see too much supporting the narrative about her becoming upset because of her lack of relevancy.