As long as we consider emotions and desires were generated by immaterial spirit, AI will never be able to replace humans but what if these are just biochemical algorithms.
They're physical and biochemical processes indeed. We have no basis to think that emotions and desires have an "immaterial spirit" source. If that was true, then maybe women can't have emotions, because, according to some Islam doctrines, women don't have a soul. Other people can find that statement false, but that's what the source says!
Interesting reading. I will look up the book.