The reference is the Catechism of the Catholic Church.
The teaching is that Adam, Eve, the serpent, the garden, and the tree were used figuratively to illustrate a point. It's quite complicated, but leading Catholic theologians are now considering ancient language and cultural mis-translation, scientific proof of evolution, and other relevant factors to better understand ancient Scripture.
It was also pointed out that it doesn't matter if you believe that Adam and Eve were actual people, or not. The point is the origin of sin.
You mean the one I just quoted?
I didn't get any of that out of the excerpt on the topic from the Catechism posted above.