Earlier quoted context omitted.
They are wholly owned by GM are they not? Starting this way doesn’t preclude them taking Tesla’s vision only approach in the future. Even Tesla initially had a radar vision combination approach before moving to pure vision. The real question with whatever technique being used is can they drive the hardware cost low enough that it can be widely deployed.
They moved to pure vision because they were constrained by radar suppliers because of supply chain issues and the chip shortage, not because of any ML progress - they were actually investigating using a higher resolution imaging radar before the pandemic.
They also have Lidar cars in Fremont that drive around every so often, that doesn't mean they plan to go into every car anytime soon. It'd be short-sighted to not continuously evaluate solutions that previously had constraints (despite what Elon says, they'd add Lidar if it made economic sense and it showed an improvement over camera-only, as their camera detection is pretty accurate these days in FSD).