This claims to bypass the telematics functionality:

https://www.autoharnesshouse.com/69018.html

> Note for customers retaining OEM headunit: This adapter can also be used for those wishing to remove/disable the OEM Subaru Telematics functions. This is done to eliminate the tracking cabability that Subaru has built into these vehicles. If this is you, we will need to add an additional part to this adapter to re-enable the bluetooth microphone. Please purchase the option 2 adapter near the bottom of this page for this situation.