And how can we know if it really is? Throughout the film, the characters repeatedly question whether Will is still the same person once they put him in the car. According to Evelyn it's him but the other protagonists aren't so sure. I personally think that the human mind, made up of our intelligence, consciousness, self-awareness, emotions and desires, which emerge from and depend on organic matter (our body and the environment) cannot be transferred to an inorganic entity made of wires, silicon and metals. When an object is broken and reassembled into another form, it may retain the essence of the original object, but that's not the most important thing.