Everything he says is that he's a guest. His not being able to be shot pretty clearly defines him as a guest and I think that was supposed to be the surprise since the man in black in the original is a robot.

Then he takes the one robot out and scalps him for what I assume is the tech that's lodged in the top of his head.

Does it make sense that people lost track of him? That during a time in which robots are going haywire that nobody pays much attention to him kidnapping a robot and making it go offline? Not really but I think we're supposed to just overlook that moment.

EDIT: I guess there could be some kind of suspension of disbelief about him being a robot that's gone rogue and somehow gotten out of the loop so he's deemed a guest but that might require an even bigger suspension of disbelief.