If machines extinguished the human race, this would be wrong according to the precautionary principle.

We still don't know exactly What our conscience consists of, Descartes' 'Cogito ergo sum'.

The prevailing opinion among scientists is that consciousness is only attributable to neural connections, and therefore reproducible in a computer (that is, the concept of Mind upload).
But we're not sure if that's the case. There may be more. For example, the hypothesis of Penrose's quantum mind is minority but not yet completely denied.
But in general, since we still don't know exactly what consciousness is, there is a possibility that if machines killed Sapiens Sapiens something would be lost that cannot be reproduced on a machine.
He's not sure if that's the case but he's also not sure if that's not the case.
So for a precautionary principle it would be appropriate for Sapiens Sapiens to try not to become extinct, also because we don't know if something like this actually exists in some other part of the universe. It probably exists, but we don't know for sure