You're confusing matters. Hoyos is talking about private actions and words of the Pope (like Assisi) - the motu proprio is an act as Pope, not as a private doctor.
No, I got Hoyos' meaning--and extended it. Sure private statements and actions have little authority--but they reveal a great deal about the mind of a Pontiff. In this regard, Assisi told us a great deal about where the Pope wants to lead his Church. And it is towards a Brave New World of Pan-religious heresy. Yet this is the Pope who dares lecture someone like Lefebvre about Tradition. What a farce! That is why I mentioned the motu proprio. The two are connected. One reveals the myopia and injustice of the other.