You are blind, deaf and dumb, and you read texts however you want, even when the person who said them is still alive, Ladislaus.
St. Alphonsus says this, "Thus, then, according to the Angelic Doctor [St. Thomas], God, at least remotely, gives to infidels, who have the use of reason, sufficient grace to obtain salvation, and this grace consists in a certain instruction of the mind, and in a movement of the will, to observe the natural law; and if the infidel cooperates with this movement, observing the precepts of the law of nature, and abstaining from grievous sins, he will certainly receive, through the merits of Jesus Christ, the grace proximately sufficient to embrace the Faith, and save his soul.” - this is not Pelagianism, this is God working to give grace to those who observe the law of nature, to bring souls to the Faith and save their soul.
You are a Calvinist and a Jansenist if you believe in total depravity and that all the actions of infidels are sins. St. Alphonsus is distinguishing, and Bp. Fellay seems to be doing the same, between a pagan who strives with the aid of grace to live uprightly, and another who does not. The first can be saved, not because natural law in itself is salvific, but because good natural actions can prepare and dispose the way for supernatural grace.
Pope Bl. Pius IX had said, "7. Here, too, our beloved sons and venerable brothers, it is again necessary to mention and censure a very grave error entrapping some Catholics who believe that it is possible to arrive at eternal salvation although living in error and alienated from the true faith and Catholic unity. Such belief is certainly opposed to Catholic teaching. There are, of course, those who are struggling with invincible ignorance about our most holy religion. Sincerely observing the natural law and its precepts inscribed by God on all hearts and ready to obey God, they live honest lives and are able to attain eternal life by the efficacious virtue of divine light and grace. Because God knows, searches and clearly understands the minds, hearts, thoughts, and nature of all, his supreme kindness and clemency do not permit anyone at all who is not guilty of deliberate sin to suffer eternal punishments." This was interpreted wrongly by people on both the left and the right.
Some, like the blind person here, claimed the Holy Father was a "Pelagian", from their own false understanding, and became schismatics and heretics in doing so. Others falsely claimed this meant non-Catholics could be saved as non-Catholics, when the very error the Pope is controverting here is the error that it is possible to arrive at salvation though living apart from the True Faith and from Catholic Unity. They were wrong too. So why did the Pope mention natural law? Is it salvific? No, but beause as grace builds on nature, and God often prepares the way to supernatural grace by good natural actions (as He did for Cornelius, as St. Peter and St. Thomas say), therefore the Holy Father mentions it. That's all. The Catechism published about 10 years after this Encyclical, with the approval of the Roman Congregation for Propagating the Faith, explains it clearly.