That list is probably the exact list of google customers that get any real support from google
The issue is people expect free products they haven't paid a penny for to have live customer support, which doesn't make much sense at the billion user scale.
It's miserable in my experience.
For GCP, you can get 4-hour response time SLA for $100 per user. If you want 1-hour response SLA it's $250. Then there's Enterprise Support if you need 15-minute response SLA, TAM assigned etc which costs more.
Caveat: I work at Google Cloud.