So in what way, then, was this car "autonomous", If the "safety driver" was supposed to be watching the road and liable to have to take over at any second.
As far as I can see, the combination of Uber vehicle and safety driver were incapable of avoiding an accident, in conditions where a full time driver in a "normal" car would have avoided it.
Indeed a normal production car with autobrake and collision avoidance (ie. what the Volvo should have been capable of) could have possibly avoided the accident without driver intervention, which makes the standard production Volvo more of an automaton than the prototype Uber vehicle.