More on the declaration of something “authentic magisterium:”
On this point the Second Vatican Council taught in the Dogmatic Constitution on the Church Lumen Gentium,
[Lumen gentium 25] (bolding mine)
This religious submission of mind and will must be shown in a special way to the authentic Magisterium of the Roman Pontiff, even when he is not speaking ex cathedra; that is, it must be shown in such a way that his supreme Magisterium is acknowledged with reverence, the judgments made by him are sincerely adhered to, according to his manifest mind and will. His mind and will in the matter may be known either from the character of the documents, from his frequent repetition of the same doctrine, or from his manner of speaking.
Do Catholics owe the “religious submission of mind and will in a special way” to changes in "ecclesiastical law?"
I would like to perfectly know the answers to this, but I doubt I will.