Or they could not be. Which seems like the more likely case given the current state of self-driving cars that cannot even safely drive down a pre-planned underground tunnel without a driver. (The Tesla tunnel)
I was referring to Musk claiming this a few years back. Added a /Musk for clarity.
Hinting that this is probably about as much bullshit as when Muski says "Next Year" 8 years in a row for fully autonomous driving.
PS: The Muski was a typo, but I'll let it stand, because it's an excellent reference to Musk being a Russian asset.