Ironically in happy conditions there's much more leeway in an airborne craft for the autopilot to make the occasional mistake: you don't really run out of air if AP misses the mark by a few degs for a few seconds, whereas on ground you'll quickly run out of road.
In a way flight mode normal law is closer to autopilot than to actual direct mode piloting.
So "autopilot" would be technically correct, although piloting in automotive has a significantly different meaning than in aircraft, I mean pilots are for racing...
But anyways even if technically correct "auto" is sadly misunderstood as "human do nothing" which is untrue...
"self driving" though is a downright lie, "full self driving" is a tautology, as there can not be such a thing as "partial self driving: either a thing drives itself or it does not! (and as of today no automotive vehicle does). "supervised full self driving" has to be the most obscure, convoluted, and oxymoronic way to say "autopilot".