So there's a video of him addressing this - he doesn't hate the tech. He mentions that it's wildly expensive for cars. But, they use it heavily for SpaceX
Because the company has promised that existing Tesla owners would be able to use FSD.
Having to retrofit them to add LiDAR sensors would be cost-prohibitive.
And those don't translate across to the Optimus bot.
And based on what we've seen the results haven't improved enough to put them close to Waymo.
We know this because there have been public presentations about it.
And inventing groundbreaking new tech is so far the domain of academia and large, well funded R&D labs. And almost always shared.