> No, just the common understanding of autopilot for aircraft.

The autopilot for a aircraft does whatever it is supposed to do without human supervision. If you turn on keep heading, it will keep the heading (within physical limitations). I guess it is similar for a boat.

Lane assist, however, requires constant human supervision because it is just an assistant. I think this is the important difference that needs to be highlighted here.

I agree, and Tesla's "autopilot" was just lane keeping and adaptive cruise control along with a bit of collision avoidance.