To the bolded: I agree as well, but, then again, I wasn't using the catechism quote to "prove sedevacantism". I was using it to point out inconsistencies in the non-sede position though.
One difference between sede's and non-sede's, is that non-sede's understand that our knowledge of the popes sins do not qualify us to depose him.
.....Yes, the faithful may know well that he [the pope] has committed a sin to which a censure is affixed by the Church, but this knowledge in no way qualifies them to declare him deprived of his office, or never to have been elected.
Sede's are to different degrees, obsessed with a circuмstance which they are not qualified to settle. For sede's, it is *the* fundamental problem all trads should be focused on - so much so that it becomes the all encompassing focus of their attention, up to the point that everything about the faith always relies on and comes back to the matter of the pope.
In these times as throughout history, we are to submit to the pope in all things not sinful or harmful to the faith, same as any superior - that is what God expects of us. When we appear before our Judge, He will not ask us what was our opinion on the legitimacy of conciliar popes.