I know Dan, there is always an excuse, always a reason why it ain't what it is.(lol)<quoted text>
Yes, unfortunately for you, it DOES have to say it in the Catechism.
If it's not in the Catechism, it's not a teaching of the Church.
The early part of the 15th Century isn't what's termed commonly as "pre-Vatican II", as Vatican II was held 500+ years from that time.
Nothing wrong with putting relgious leaders feet to the fire. We do that all the time with everyone else in authority in our world. Church leaders are not exempt, and so they shouldn't be especially what we have learned the last 10 years or so.