But he is absolutely right about that. There is in humans a sort of essence. We can't currently fully pin it down, but it is something related to our intelligence, to our feelings, to our consciousness, and to our souls. This is worth preserving.

Then there are these many other things: our skin colors, our two legged locomotion, having five fingers, lungs that breathe air. These things are not required, and could be improved our replaced without losing who we are.

You could imagine fully replacing biological humans with purely electronic robots, but such a thing is not possible at our current poor level of understanding of our essence. There is simply too high risk of losing part of it.

But in the far future with super-intelligent robots and/or genetically engineered post-humans, what could the role of a current-human even be? He would be a living fossil. A circus animal novelty, a pet? A primitive indigenous people with Terra as their reservation?