Can “perfect contrition” do that?

Snip from Bread of Life........

"I am not going to think it as difficult for a Catholic who has fallen into mortal sin but who, through his Faith, remembers his
Holy Communions, his Blessed Mother, his past confessions, God’s rich forgivenesses in the sacraments, to make an act of perfect love, as for a catechumen, who has not had yet the benefit of one of God’s sanctifying sacraments. But the very fact that the Church requires every mortal sin committed to be confessed, whether one is perfectly sorry for it or not, shows the Church has a maternal suspicion of this perfect act of love of God obtaining forgiveness apart from the Sacrament of forgiveness instituted by Christ."

Pope Boniface VIII's teaching in Unam Sanctam, the second sentence of opening paragraph states that: "We believe in her firmly and we confess with simplicity that outside of her there is neither salvation nor the remission of sins".

Those not yet baptized are "outside of her."