Sandboxed google play can only send the location to google if google services or playstore were granted the location permission. Accessing location for apps, including google, cannot be sidestepped as MicroG once allowed.

GrapheneOS lets you change aspects of location, including PSDS, SUPL, and network location. GrapheneOS also reroutes googlefusedlocation requests to the OS. If you would rather be able to turn it off entirely, GrapheneOS is is capable of this, not MicroG.