Last July, MIT researchers released a report about Tesla driving over a billion miles on autopilot, over two orders of magnitude more than Waymo, with 3 fatalities. That would make it 4x safer than human drivers.
And here's the thing: it flies in the face of what Waymo is doing and what Ben Evans suggests. Unlike Waymo and the other autonomous cars, they aren't being driven in a restricted area, they don't have a professional safety driver behind the wheel, and they aren't being monitored remotely. It simply feels that their training set is 1000x Google's.