By that logic, anything that is protected by crypto, if you threaten the owner with violence, it can be stolen from them. Which is just about everything on earth, if you're willing to apply sufficient violence.
Seriously, it is unlikely someone would put the money and R&D effort required to replicate the researcher's solution with the goal of stealing these camera systems on the wheels that can be disabled remotely.
So I'd rather advocate for Tesla to continue using inexpensive and secure enough solution to unlock doors. And focus their efforts on making the thing actually safer, like not accelerating into and colliding with concrete barriers.
At least not before it's driven into a warehouse somewhere and cut apart to be cannibalized for repair parts, then parts shipped overseas.
Or people who want $20,000 worth of 100kWh 18650 battery conveniently packaged with connectors and cooling system.