He’s absolutely right, and the headline is misleading. He’s saying that Vatican II is not some kind of super council, which supersedes all that came before. He’s also right that the documents vary in authority.
The Holy Father is well aware of this, and has spoken about it before. This regularization process, whether or not it is successful, affords an opportunity to bring these questions out into the open for the first time if forty years.
Your excellent post is a very good summary of the situation.