Cameras are always used for LKAS, even things like Waymo mix cameras with LIDAR. That’s the only way to see the lines on the road, etc.
Now for ACC that’s always radar except for newish Tesla. Same with blind spot monitoring and parking sensors unless those are ultrasonic or something, but not cameras except for Tesla.
See comma.ai how one can basically do LKAS and adaptive cruise with one camera, but IME it typically uses the radar based ACC built into the car already.
No because he has all his vaccines. He just spews vaccine rumors but then gets his shots.