You are mistaken in thinking they taught against invincible ignorance; they didn't teach it, but they didn't condemn it. Invincible ignorance neither saves nor damns.
You think that just because something isn't explicitly condemned or corrected it must therefore be acceptable or true. You are quite mistaken.
I don't think any implcit BODer ever claimed it saves. What saves is having supernatural charity;
Of course they do. They give a better chance of salvation and practically give Heaven away to these people.
So the just man "shall scarcely be saved" (1 Peter 4:18), and yet these people, knowing nothing about the Church and having no sacraments or any helps at all will get into Heaven.
And what about original sin?
"Ignorance is the mother of all errors," as Pope Benedict XIV said.
Go see how any savage lives.
the implicit BODer believes that it can be had in a person invincibly ignorant of the Church (yes, even for Buddhists, Muslims, etc.), but nonetheless, also there must be some explicit belief in some articles of the Faith (Jesus is God, etc.) and they must reject the errors when they are offered the Divine grace.
What you said is heretical and the quotes from Lefebvre or Fellay or Fahey don't say what you say. They make no mention of any "explicit belief in some articles of the Faith (Jesus is God, etc.) and they must reject the errors when they are offered the Divine grace". They blatantly teach salvation ourtside the Church and in all religions.