At the end of the article, they discuss how the report stresses a need for more secure transmission systems on the CAN bus, as well as potentially including things like permissions-based security
It's just another biometric matching system. So it might be used as a form of sign-in to your car's network or data, better than taking your hands off the wheel to key a password. Or a LoJack complement that identifies your car's thief.
How would this enhance privacy? It seems like it would do the opposite?