I mean I think its still a valid point. The car in the show was sabotaged, and that is definitely something that might be a thing once all cars self-drive. Especially once they remove controls like steering wheels.
There hasn't been a tesla FSD hack yet, but it would take spoofing a software update (and spoof the authentication and certs, etc)... The attacker would need to have access to a pretty massive supercomputer to make their own custom self-driving software and today getting the certs and everything right is next to impossible... but even then its only next to impossible, not impossible.
There are still a lot of other layers that need to be compromised past the cert for such an attack to even be possible. Even so, I suspect when such an attack does happen it will probably be for stealing cars. Your car would just wake up in the middle of the night and drive itself somewhere else to be cut up for parts. Less likely is any kind of safety issue since its so easy to take over control of the car.
I’ve been repairing cars for over 15 years. There’s a massive spectrum for quality on almost any aftermarket replacement part. Literally the same part can range from $50 to $400 and the only difference is quality and durability.
Sometimes the cheap part is fine, sometimes they cause weird problems. Especially electrical parts.