What does "lights out" mean here? Is it a way to describe a nearly fully-automated production line?

If that's the case, then aren't they using it for Model 3/Y already? If yes, then I have to disagree with you, because neither of those cars look anything like Cybertruck, even stylistically.

EDIT: thanks for explanation in the replies, it makes sense. If anyone has any additional insight as to how it affects production lines that are, let's say, 90% automated and 10% manual, your contribution would be heavily appreciated.