Initially I took Google's side given Gebru has history of bullying so aggressively and has no qualms to play race/gender cards at every opportunity she gets. But now that more details (including the paper in question) has been revealed, it's hard to stay on Google's side. It is clear that the peer review process that Jeff Dean had described has been optional for all intent and purpose. It says along similar lines that right there on their internal website. Too many Googlers have attested that they have bypassed the process with no consequences. Gebru's paper itself has no real technical novelty. There was no reason to fire her. It doesn't seem out of line that Gebru was befuddled, frustrated and made a threat on the basis that she had right for the information. Jeff Dean could have easily offered her feedback and transparency in decision process. He could have agreed to let her make corrections later in the submission process. He did none of that and doesn't want to come out clean.
Having said that I still feel Gebru is extra-ordinarily self-entitled person. Few months ago she insisted that Jeff Dean take her side in Twitter feud she initiated. She has the mindset of either you are with me all the time or you are racist+misogynist. She complains about "micro agressions" towards her from everyone but she herself is super aggressive. When disagreement arise, she marks you down as enemy and launches attacks to destroy you completely with sole purpose of making you homeless, jobless and making sure your kids die of hunger. I wouldn't wish upon her as colleague to anyone. You might have right to disagree with me but this is what I have felt. I still take her side in this current episode nonetheless because I think she is on the right side.
Ultimately we are all playing opinion game here and only few people knows what really happened.