Simulation

In "Precession of Simulacra" on p.3 of Simulacra & Simulation, Jean Baudrillard differentiates between pretending [dissimulation] and simulation. To simulate is to feign to have what one doesn't have. One implies a presence, the other an absence. "Whoever fakes [dissimulates] an illness can simply stay in bed and make everyone believe he is ill. Whoever simulates an illness produces in himself some of the symptoms." Dissimulating leaves the principle of reality intact. The difference is always clear, it's simply masked, whereas simulation threatens the differentiation between true and false. Is the simulator sick or not?