Elon has said it is better/safer then a human.
Because autopilot is not autonomous and no one claims it to be. It e.g. cannot solve crossroads or react to traffic lights.
So I guess he either said that about FSD (which would still be questionable but at least not nonsense) or he meant that drivers using autopilot assistance have in general less crashes than drivers who don't use it.
Again, no Tesla owner thinks autopilot is full autonomy, since it very clearly isn't. I don't know if you have ever used it, but you would find out after driving a few meters.
Also right here, in this case, we have a Tesla owner who seemed to think it was, and is dead.
And regarding the victim – nah, he knew full well, he was just careless. Many drivers are.