Why does it need a long, involved list to tell them what the bible already told them almost 2000 years ago?
It doesn’t. The list is for the readers, the laity. the Catechism is for the laity, not the clergy.
It gives references. It states that they consulted the Bible, and where they did so.
I just post it to illustrate that the Bible is certainly regarded in this situation, and that in at least this religion, does not rely on Leviticus.