Why would it state on the official Motorola website that it was upgradable to Pie if it wasn't going to be for all carries especially since Verizon Consumer Wireless and Att&t version have already been updated?
The Moto website is sadly dubious at best and they have had a whole butt load of problems with Pie on the G6 especially the G6 Play (the 32bit OS is the biggest reason and why no one sticks with the Play series anymore) Your safest bet would be buying a G7 Play temporarily if you really need Pie or moving on to a new phone brand.
That for one would certainly not be a good look for Motorola who just add a number higher with all the same specs and a updated Android OS and call it new and rip off customers. Isn't there anything that could be considered false advertising in a court. Of law?