The consciousness, which is the true self is self-illumined. So how can the body, which is inert (insentient) and illumined by an external agent be the consciousness, which is present only within the waking/dream?The consciousness [soul] the true self is apart from the three states and permanent, as it endures even after the death of the body and world within the waking/dream.
Even the subtle body consists of many parts and is unstable. It is also an object of perception, is changeable, limited and non-existent by nature. So how can this be the true self, when the body exists only within the waking/dream?
The immutable soul, the substratum of the ego, is thus different from these two bodies, and is the true self, the consciousness, the formless witness of the three states; and it is present in everything and everywhere in all the three states and yet transcends them all
Thus the enunciation of the difference between the soul and the body has (indirectly) asserted, indeed, after the manner of the inquiry, analysis and reasoning, the reality of the three states. The birth, life, death and the world are part of the duality [waking/dream]. The consciousness, which is the true self and it, is the formless witness of the birth, life, death and the world.
Thus the view that the body is the true self has been denounced by the enunciation of the difference between the soul and the body. The seeking mind has to grasp the truth, between the three states and the formless witness [true self].