

Just use the regular Garmin account and Bluetooth to your phone every 2 weeks to sync for health data use storage scopes and permissions to stop unwanted data collection, use privacy settings in the app, fake account. Be done. Never use support they will dox you.
Permissions stop what the app can and cannot access in your phone, and storage access allows what the Garmin app can and cannot access in storage of data. Keeps your app more private with the added benefit of perhaps running leaner on your device.