They may have painted themselves into a corner by saying the current hardware is sufficient for "full self-driving capabilities." The worst case is they're putting half-baked solutions on the road.
Yeah. Theoretically the claim is true (at least wrt. the sensors, not sure about computing power onboard). Tesla's hardware is already better than human hardware for this task.
The trick is, they'd have to advance the state of the art in software quite far, to derive "full self-driving capabilities" from this hardware.