there's a lot of infrastructure at Google. And claim is correct - GCP and Google is on top of the same servers, same backend systems. Are they on the exactly same servers? No, of course not -- there's a few servers out there :-)
This was a global network outage, we can't talk about the "exact same servers". There seems to be an implication that Google runs on GCP and a global network outage can't affect all GCP's customers but one.