I've confirmed with my own 2 eyes cars driving on the road without humans in them. I've also rode in a Waymo which had no driver. They definitely exist. Teslas also have self driving.
These people are basically Moon-landing deniers. They crop up a lot these days, sadly. I wish they'd crop up somewhere else.
Is that self driving in the sense of fully autonomous, or it only works on whatever Waymo/Tesla have mapped to the milimeter?
I've never seen any clear info about that.