" all the compute technology required is packed into this chassis"
Well, not quite all, because as the article explains in some detail, the systems are nowhere near real-world ready.
The argument really is whether they ever will be; after all, the problems illustrated are all on American roads, which are basically wide and straight with right-angle junctions, plenty of signage, and reasonably law-abiding drivers. How would it go in Naples, I wonder?
Nirvana is further away than you think imho.