Oh, I've not only read the documents of Vatican II---I make sure that my students read and do research on them.  However, my comment refers to the fact that Joseph Ratzinger, as the director of the CDF, wrote in two essays reflecting on the formation of conscience that "people are guilty of sin for not knowing the moral law."  I am referring to:

Joseph Ratzinger, "The Dignity o the Human Person," in Commentary on the Documents of Vatican II: Volume 5, Pastoral Constitution on the Church in the Modern World, ed. Herbert Vorgrimler [New York: Herder & herder, 1969] p. 136.

Joseph Ratzinge, "Conscience in Truth," in CRISIS OF CONSCIENCE, ed. John M. Haas [New York: Crossroad, 1996] pp13-15.

Thus in Ratzinger's mind---people are guilty of sin, even if they don't know or understand God's mind.  According to Joseph Ratzinger, this also applies to peoples of all cultures.

His teachings contrasted those of the theologians of the thirteenth century---Aquinas & Bonaventure.