It's not telling the whole truth, because the average person doesn't fly planes and has no firm grasp on how extensive a plane's autopilot is, or what the difference in situations is. What they do see is the Tesla marketing videos that hype it up to be better than it actually is.
In the context of someone using airplane autopilot as a defense of Tesla, they're not omitting anything. So I don't think that's a full answer to my question.
It's lying by omission.