(Part II)
By your line of reasoning, Popes Pius IX and X are heretical in that they both affirm that variations of "those who find themselves outside of the Church, through ignorance, are excused" (Singulari Quidem, 18 and Catechism Questions 132 and 280).  Indeed, Aquinas when speaking on the subject (and which, when quoting, those on the Internet who seek to prove either a Feeneyite proposition or a Protestant one - dismissing an overly-dogmatic Catholic Church - shorten and deprive it of its context) states, "Thus no man should think it of small account or allow himself to be cut off and expelled from this Church, for there is but one Church in which men find salvation, just as outside the Ark of Noah it was not possible for anyone to be saved," (X, A-3) from which we find, often, the first 22 words of his catechism cleft.