Another bias is baked into this announcement: how would it fare in Boston, NYC, or DC? Are they better because they're better than humans or are they better because they're cherry-picking their test cities?
Narrow streets packed with park cars, lots of bikes and pedestrians jaywalking, a homeless population that spills over into infrastructure, etc. It’s a good test case for most US cities that aren’t NYC.
A LIDAR is pretty much all you need to avoid a collision. It's a pretty forgiving environment.