Maybe that's true, maybe it's not, but there is deep information asymmetry here and google has all the advantage and must have anticipated that this would end up in discovery and litigation and that the records of the terminated people's employment would be subject to it. That means their chat history, their email history and office surveillance footage.
I have a hard time believing that google would have fired people where the sum of their recorded actions couldn't be reasonably construed to be disruptive.