I've heard about bugs in the throttle position channel from a few coworkers that worked for several different manufacturers. This was awhile ago though and most bugs have been sorted.

Creating a car crash through brake or steering manipulation sounds a bit far fetched. Throttle position on the other hand does not have any type of redundancy in most modern cars (no mechanical means of restoring control). If you have access to change TP, either by GPS coordinates or remote, you could cause a crash pretty easily by sticking the throttle body WFO. The driver always has options to stop the car, but in panic mode...who knows.

I am still withholding judgement and will watch the investigation with interest.