Unsurprising and seen here: [0] A text book definition of a backdoor. It is still not your car. It is still Tesla's. [0] https://news.ycombinator.com/item?id=26512855
No, if you don't pay for it then it's the bank's car. It's like saying "the super stole my TV!!" when actually the super just let the police in with a search warrant, and they took the TV you stole down to the station.
Evidently, the car isn't yours, even though you have paid for it. Tesla still owns it.