You’ve quoted fallible opinions from Popes, not infallible pronouncements from the church.
Encyclicals are expressions of the ordinary Magisterium. To quote Pope Pius XII from
Humani generis:
It is not to be thought that what is set down in Encyclical letters does not demand assent in itself, because in this the popes do not exercise the supreme power of their magisterium. For these matters are taught by the ordinary magisterium, regarding which the following is pertinent: “He who heareth you, heareth Me.” (Luke 10:16); and usually what is set forth and inculcated in Encyclical Letters, already pertains to Catholic doctrine. But if the Supreme Pontiffs in their acts, after due consideration, express an opinion on a hitherto controversial matter, it is clear to all that this matter, according to the mind and will of the same Pontiffs, cannot any longer be considered a question of free discussion among theologians
As such, they are authoritative and if an encyclical “settles” something then we need to pay heed where that concerns a matter of faith and morals, which the Social Doctrines of the Church, including the teachings on supranationalism, do (hence why it’s called social “doctrine”).
Catholics are not at liberty to treat encyclicals as mere expressions of opinion in matters of faith and morality. That doesn’t mean that “technical” facts or scientific principles assumed in encyclicals are binding on our conscience, but whatever ethical or faith positions are derived from them
are.
Hence why, in our earlier discussion, Josie and myself got into such a heated and precise battle over the wording of single sentences in different encyclicals. We did so because what the Holy Fathers are communicating in these texts
matter.
To non-Catholics, this will likely appear needlessly pedantic and akin to an obsession with semantics but to Catholics it’s serious stuff, because it pertains to the deposit of faith and the correct understanding has to be ascertained.
The catechism, by the way, is nothing but a “sure norm” of the faith, a constitutional guidebook if you will for the average layman. It’s like a codification of important snippets from the church’s unwritten constitution, based upon hundreds of thousands of scriptural references, medieval canons, judgements of ecumenical councils, papal bulls, encyclicals, constitutions, apostolic exhortations etc. from the last two thousand years.
It’s a guide, a norm, but it’s “authority” comes from the texts it is referencing and it is not completely comprehensive in that respect. There have been many previous catechisms, the earliest being the Didache from the first century and another famous one being the Roman Catechism of the Council of Trent in the 16th century.
If the church has a constitution, it is more akin to the British one - unwritten, disseminated across multiple organic sources from centuries apart that attest to the Sacred Tradition - than it is to the written US constitution.