Not that I'm confident about either side of this, but the TOPS isn't the only important factor here. It's also the efficiency. If Tesla's CPU can do more ops/watt, then it's more ideal for the conditions that Tesla needs the CPU to fulfill. On top of that, I have no idea what "320 TOPS" means in the context of the specific workload Tesla has. Will they _actually_ get 320 TOPS?
Except that it isn't. NVIDA's Drive AGX Pegasus delivers 320 TOPS:
https://www.marketwatch.com/story/nvidia-says-tesla-inaccura...
Of course, nobody inside the Musk Reality Distortion Field actually cares about this.