YOU said that explicit beilef in the Trinity is necessary for salvation and those who deny it are heretics.
Pius XII and Pius IX say that the invincibly ignorant (who by definition have never even heard of the Trinity) can be saved.
Therefore you claim Pius IX and Pius XII are heretics.
Logic 101.
One day you will realize the way that the Church actually interprets EENS and it will all make sense. For those who have been exposed to the doctrine of the Trinity and are not mentally or morally impeded from believing in it, yes, they are culpable to believe in it. But stating that someone needs to explicitly believe in something to be saved that he has no way of knowing is completely assinine.
I'm still waiting for you to provide a quote which proves that these Popes taught that belief in the Trinity isn't necessary for salvation.
On another note, I want you to pay attention and pay attention very carefully.
Pope Pius IX taught that those who are invincibly ignorant of the gospel CAN be saved, NOT that invincible ignorance can save you. He held that those who are invincibly ignorant, if they persevere in the natural law and are open to the Truth and would accept it upon knowing it, can be saved not BECAUSE OF their invincible ignorance.
Show me a quote where he, or Pius XII teaches that being invincibly ignorant can save. SHOW ME 1 QUOTE WHERE EITHER OF THEM TEACH THIS.