Roger Stanyard

The position nowadays is that humans are the product of evolution but that God changed humans at some unspecified time by giving them souls.

That's incorrect. The Church doesn't make any scientific pronouncements, it has only tried to reconcile its theology with recent scientific discoveries. In other words - "this is a scientific idea that we don't think is in conflict with our theology, so feel free to accept it if you want." This is not the same as a rejection of creationism. As I explained earlier, and what should be extremely obvious, belief in separate creation of living forms was never incompatible with Catholic theology.

A summary of Humani Generis, from wiki:

The question of the origin of man's body from pre-existing and living matter is a legitimate matter of inquiry for natural science. Catholics are free to form their own opinions, but they should do so cautiously; they should not confuse fact with conjecture, and they should respect the Church's right to define matters touching on Revelation.

Catholics must believe, however, that the human soul was created immediately by God. Since the soul is a spiritual substance it is not brought into being through transformation of matter, but directly by God, whence the special uniqueness of each person.

All men have descended from an individual, Adam, who has transmitted original sin to all mankind. Catholics may not, therefore, believe in "polygenism," the scientific hypothesis that mankind descended from a group of original humans (that there were many Adams and Eves).