"In Catholic thought, this has been interpreted to provide room for the concept that human beings were created over millions of years through evolution, and that God ultimately provided pre-existing, pre-created souls to those He designated and that these souls reconnect to God through practicing the sacraments. "
This is a fairly serious misconstrual of Catholic doctrine. There is nothing whatsoever in the Catholic faith that points to the supposed existence of "pre-existing, pre-created" human souls. in fact, from a Catholic anthropological point of view, this is simply unintelligible.
The Catholic Church teaches that it is precisely the soul which makes a material "thing" (matter) a living human person: it is the "form" of the body. Therefore it is created immediately by God upon the formation of a new human body, i.e. at conception (since the zygote, even at one cell, IS a body,and IS ensouled, which is to say, alive.)
Anyone could have learned this in 2 minutes with a few mouse-clicks to the Catholic Catechism (Link). I was surprised to see this rather egregious blunder, and I hope it does not suggest an overall casualness about accuracy in this article.
Thank you for your clarification on the Catholic view of souls. Would the term “separately-created souls” instead of “pre-existing, pre-created” be accurate?