I'm guessing that Google had deployed Level 4, built with legacy technology. Very large codebase, strong dependency on a well serviced Lidar, dependency on accurate calibration, dependency on real-time high fidelity maps. A solution scalable to well-managed fleets in good neighborhoods. If this is the case, the others still have a chance at getting to Level 5 in the same time frame as Google. If they play the technology in a right way.