As far as i know the tesla car has its own spotify account. So this only works, if you’re the only one driving your car. In my family up to five people drive a car - I don’t think i want one spotify-account used by five people.
Not sure if the associations are per-user or per-car, though. I believe there was work to move them along with some other settings to your "user profile" and would go with you across cars.