Ping
Here, for instance, we have a summary from a 1993 article from the (non-Catholic) Christian Research Journal
... he has to quote a Protestant (and often very anti-Catholic) publication to try to make his point. The "Christian Research Journal" is not, and has never been, a reliable source on what the Catholic Church believes.
Feeneyism was rejected by the Holy Office in their response disciplining Feeney in 1948. (To be clear, it is not heretical; it is a "tolerated opinion". Feeney was disciplined specifically for saying that his superior, Cardinal Spellman, was a heretic for rejecting it.)
Practically all reputable Catholic theologians prior to VC2 agreed that (at least some) non-Catholics could be saved by following the grace they were given, on the grounds of "invincible ignorance," believing, as Pio Nono and other said, that God punishes only _voluntary_ fault.