Interesting, I have read similar statements outside the Roman Catholic Church. Once such argument is there were other homo sapiens sapiens but God pulled Adam and Eve into the Garden. Today humans can be traced to Adam and Eve because all other lineage died-off. This theory would solve the DNA lineage issue while at the same time keep open an actual Adam and Eve. (Without a real first Adam how can you have a real second Adam.)
The problem is this "theory" is not really a theory but a way to appease creationist and evolution. As with any "bi-partisan" solution, it will not satisfy either party. Evolutionist will still wink and say "whatever your Christians want to believe" while creationist will argue that this comprises does not address that GOD uniquely created Adam and Eve.
What I like is that creation was choosing only Adam and Eve to be made in the likeness of God. Creation was to give only them an everlasting soul which other primates did not have.