Earlier quoted context omitted.
Somebody at Google made the conscious decision that enacting this intentionally defective policy -- in doing so, attempting to foist liability for data custody upon individual employees -- and fighting the inevitable objections to it was a preferable course of action to actually preventing their employees from discussing anything that might be used against them in the suit. It's clever, but it doesn't reflect fondly…
I don't think they were trying to shift liability, I think they were trying to make sure all the data was deleted, without themselves having to hit delete. It's their counsel's culpability that is being protected, i.e. the difference between being negligent or willful.
They were trying to avoid liability not transfer it.