Not an expert on car hardware. However, I do know it is difficult to buy a car without computers in everything. Computers that record tons of data. Just because they don't have modems doesn't mean they don't spill everything at the dealer/smog-check when the cable is connected.
In electric cars such as Tesla, all this has been accelerated. In a recent thread, folks told stories of buying a used car, and receiving the PII and driving history of the previous owner.
It is also used against you, but never for you in regards to law-enforcement. Good reason to be skeptical.
