Is a human mind the simplest possible mind that can be sentient? What if, in the course of trying to model its own programmers, a relatively younger AI manages to create a sentient simulation trapped within itself? How soon do you have to start worrying? Ask yourself that fundamental question, "What do I think I know, and how do I think I know it?"

I read this as being simpler than a real human mind. Since it's simpler, the abstractions used are going to be imperfect, and the design would end up being something that is in some way artificial. It's not as explicit as I said, but I still think the implication is pretty strong.