There's no other way to understand that.
So far no one has been able to give a list of every ex cathedra statement of the pope.
Some say two ex cathedra statements:
There is no set list of ex cathedra teachings, but that’s because there are only two, and both are about Mary: her Immaculate Conception (declared by Pope Pius IX in 1854 and grandfathered in after the First Vatican Council’s declaration of papal infallibility in 1870) and her bodily Assumption into heaven (declared by Pope Pius XII in 1950).
http://www.uscatholic.org/church/2011/05/there-list-infallible-teachings
Others suggest there have been possibly as many as seven.
Catholic theologians agree that both Pope Pius IX's 1854 definition of the dogma of the Immaculate Conception of Mary and Pope Pius XII's 1950 definition of the dogma of the Assumption of Mary are instances of papal infallibility, a fact confirmed by the Church's magisterium.[72] However, theologians disagree about what other documents qualify.
Regarding historical papal documents, Catholic theologian and church historian Klaus Schatz made a thorough study, published in 1985, that identified the following list of ex cathedra documents (see Creative Fidelity: Weighing and Interpreting Documents of the Magisterium, by Francis A. Sullivan, chapter 6):
Tome to Flavian, Pope Leo I, 449, on the two natures in Christ, received by the Council of Chalcedon;
Letter of Pope Agatho, 680, on the two wills of Christ, received by the Third Council of Constantinople;
Benedictus Deus, Pope Benedict XII, 1336, on the beatific vision of the just after death rather than only just prior to final judgment;[73]
Cum occasione, Pope Innocent X, 1653, condemning five propositions of Jansen as heretical;
Auctorem fidei, Pope Pius VI, 1794, condemning seven Jansenist propositions of the Synod of Pistoia as heretical; Ineffabilis Deus, Pope Pius IX, 1854, defining the Immaculate Conception;
Munificentissimus Deus, Pope Pius XII, 1950, defining the Assumption of Mary.
https://en.wikipedia.org/wiki/Papal_infallibility#Denial_by_Catholics
For the man supposedly put in charge of the church the pope has not had a lot to say about what is or is not official church doctrine.
Without further clarification from the pope, each catholic is left to his or her own understanding of Scripture...that is unless the Catechism is considered official dogma.
And even that doesn't give an understanding of each verse in the NT.
The only place I've seen that happen is in Christian churches that use a Biblically based teaching/preaching method.
And his or her own understanding of the Catechism as well.
Unless there has been issued some sort of formally binding compendium *interpreting* the Catechism as well as Scripture.
Perhaps some Catholic could point us to that source.