They’re really digging themselves a hole. Can you imagine explaining to a jury that your “autopilot” isn’t “fully-autonomous” and trying to justify that as not misleading by pointing to “autopilots in aviation?”
It's called a 'brand name' and people are surrounded by them. I can't eat my Apple MacBook, despite the fact it is misleadingly branded as fruit. Everyone in this thread seems perfectly capable of understanding that 'autopilot' doesn't mean 'fully autonomous', and they got to that understanding through the fairly mundane and routine method of thinking about it.