So, looking at the
Corvette’s brakes hacked using an insurance dongle and SMS link from the OP, I see that the 'hacks' were lumped together and the insurance dongle 'hack' also requires physical access to the car to get at the "CAN BUS" (isn't that usually CAN bus?).
So the vector is an insecure insurance dongle providing access to the CAN bus and basically any car with a CAN bus is now 'hackable'.
Seems the insecure part is the insurance thing, or the overall security of anything that provides access to the CAN bus.