You’re downvoting and calling me wrong based on 30 seconds of research, so I’d say you are the instigator.
your initial points were incorrect
The backups in Google Drive are not accessible to you. The source you found doesn’t contradict me, because it doesn’t mention being able to access that backup, only delete or disable them.
You can only transfer your account, which doesn’t test the backup. Getting to the stage where you’ll be able to test the backup leaves you not logged in. The backup process needs a SIM.