This is just Google up to their old tricks again. They used to have an internal practice to add company lawyers to emails in order to try and make them privileged and undiscoverable: https://archive.is/1Bwgs
I don't know what the aftermath of the DoJ action mentioned in the link was, but I hope they were sanctioned in some way for it, just like I hope they get sanctioned for what they're trying to do here.