From what I understand this is actually how google communicates policies and the like via their employees, for which it is legally required to notify such employees via electronic medium if electronic medium is the primary communiation factor. This is based off of the engineer's medium article though.

That's not how Google works. She mentions in the Gizmodo article that she had ownership over these files, which isn't given out casually. Creating these policy notifications would have been a core part of her work.

Right, but her job was to advise about company policies, not her own personal politics.

It's incredibly obvious this was a violation of her fiduciary duty.