Nado:We don't know....
We are not supposed to know which is or is not - because that is for confessors to use. We are only supposed to know that we are obliged under pain of mortal sin to believe everything in the Catechism because the pope approved of it for general Catholic learning.
According to Nado, then, every word of each long-winded 10-paragraph explanation of a given teaching in a Catechism must be regarded as effectively
de fide. No theologian attributes that kind of infallibility to even the Ecuмenical Councils. So no distinction is to be made between core dogmas like the Resurrection and various commonly-held theological opinions. Catechisms, in the process of explaining various truths in greater detail, often propose notions that are not even defined Magisterial teaching but fall more into the category of "reflection". But to Nado this is all
de fide because not one notion can be distinguished from another in terms of its theological note.
Consequently, Nado reduces Catechisms (and all "approved" works) to being effectively infallible. Pay no attention to the fact that different approved works can actually disagree with one another on certain points of theology. According to Nado, we must accept the contrary and even contradictory propositions in such works as both true at the same time, that my mind must accept X and NOT X
at the same time.