We can take a pretty good guess at this point though. They're all using the same chip source, only Google got theirs a year or more earlier. Google also hasn't exactly displayed "server stacking" yet, just talked about it, and they're not the first company to string several instances of the same console together. Gran Turismo did that with PS2s. The only thing they have is their internal network and data store, and MS have been all in on closing that gap for a while now.
This is a little bit more than just talking about it. You will probably reply with "yes, but it's not a real game that is out yet" and I will reply to that with "yes, but that is besides the point, you said that they only talked about it". The video below is a real demo of multi GPU rendering.
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