I think he's just talking about his true self. How in the real world he may be some quiet businessman but in Westworld, that's who he really is.
I'm kind of surprised a lot of you think Ed Harris is a robot. It would be a nice twist but it seems obvious to me he's just a high roller who has kept coming back to Westworld for 30 years. He knows the intricacies of the park and now is testing out this new game from Dr. Ford. The design on the scalp wasn't electronics but a map of the maze. I don't know what this maze is gonna look like but it surely will be more inventive than just a hedge maze from The Shining. I think when he stated that he was never going back he meant he has paid to stay in Westworld indefinitely.
Now he might not be playing Dr. Ford's new game. He might be doing something nefarious for someone else within the company.
I'm kind of curious if they are going to introduce additional worlds like the movie had with Roman World and Medieval World.