After 3 emails spread over several months I eventually got a note saying I should expect to talk with my Google Cloud salesguy, but it can only happen over a Hangout. And not any hangout - they sent a cheap ass Android "netbook" that I had to physically go to the post office to get, that the Hangout call was supposed to happen through.
I did get it from the post office, noted that it took minutes to start up, then gave it away and never heard from GC again.
No, I'm sure they could have accepted any Hangouts call or being coerced into accepting a phonecall as well.
But truthfully what they wrote in the sendout was like I described - they outlined the procedure to go get the netbook and use it and at no point did they suggest a physical phone number to call or similar. I went along with it as far as I did just because I was kind of baffled by the suggested procedure :)
I assume it was part of some marketing scheme to try to market Hangouts and/or Chromebooks (or whatever it was) at the same time as GCP, but it just confused the sale and added unnecessary pain-points. The AWS guys just send an email and let me call them by a normal phone.