It doesn't "just" mean that. You aren't arguing in good faith when you choose to selectively use and ignore dictionary definitions of common words as it conveniences you.

Auto can mean also automatic, autonomous , you are trying to defend the meaning of autopilot by bringing aviation definition, it would be similar to me telling all the people that they are using language wrong because in chemistry or math the word X ids defined to mean something a bit different.

in physics acceleration is used when things slow down too, but at least in my language this is weird and in day to day use acceleration means increase in speed, you want to understand how/why most people define autopilot as more then dr5iver assist then just ask them and stop telling them they are wrong because in domain X the word is used different.

No but autobiographies are self-biographies, automobiles are self-mobile so an autopilot would self-pilot, i.e. pilot itself

Agreed. So "Auto Pilot" == "Self Pilot".

As in, it pilots itself. Which would indeed imply that no driver was needed.