Just a quirk of the way the portal works.
The LINE port settings come into play ONLY when connecting a POTS line to an OBi. It is not possible to do that on an OBi202 without using an OBiLINE. The LINE port settings have absolutely no impact whatsoever on GV calls.
If you want to use GV you must use the August 2021 (or later) firmware and you must use the portal to configure the OBi to connect to your GV account. After that, if for some reason you wish to make other configuration changes using the onboard web server GUI you MUST disable OBiTALK provisioning.