If I have not understood the post then it is probably their communication style.

They lay out a bunch of things to fix about a system that could bring down your browser. What if that system that communication with Google about GCP messed up for them isn't even the IPs you are contacting during unrest in Khazakhstan or an election in Uganda? What if it is a semi-intentionally confused transparent proxy?

Testing a few more things that a friendly proxy may do as it improves your connection is hardly the same as assuming the worst about your network in proper paranoia mode.