Did they mean the ability to take a ride between two arbitrary points in major cities with no limitations on time of day and weather instead?
I suspect it is just easier to define a "win" that way. L5 on a test track or L5 on a quiet freeway are very different challenges than what most people think of when they think of L5: Driving in downtown [major city] without intervention.
L5 driving downtown for an entire day with zero interventions, in a consumer vehicle, is really the gold standard for this tech. You nail that, you're done it.
Given that this is what normal people think of when they think “self driving car”, I’d say that’s exactly what they were going for.