He seems to bring up those words in the context of Pelagianism. The Pelagianism that he talks about seems to imply perfect, ideal, beyond reproach, but only perfect and ideal, because it is lived out in the fleshless, bloodless, realm of the abstract, in the world without dirt, and filth, and bruises, and doubt, and equivocation.
That attitude of certainty that the pope is speaking against involves using dogma not as an armour against sin, but an armor against authentic dialogue with people who have very different ideas and attitudes and lifestyles.
The attitude that the pope is talking about, I think, goes something like 'Church teaching is perfect and beyond reproach, beyond change, so therefore I am perfect and beyond reproach, inasmuch as I ape Church teaching".
The pope prefers doubt, and therefore openness,over a certainty that walls us in, cocoons us even. A church of flesh is subject to bruising, and growth, and transformation. Flesh lives, with all the pain and pleasure and vulnerability and thrill that is implied by a life in the flesh.
A church beyond change is a church that is calcified, hardened, as beautiful and cold and flawlessly smooth and lifeless as marble.
It reminds me of the song ‘life is change, how it differs from the rocks’.
‘The RCC is the truth, end of argument’ leaves the Church invulnerable, but untouchable. It sounds like the pope wants Italians to open up to the truths of those who are outside of the cold stone impermeable walls of the fortress church.