The SSPX is not expected to affirm what is implied and assumed and is not a known fact in 2012.

The Society of St.Pius X (SSPX ) accepts Vatican Council II as a historical event. Archbishop Marcel Lefebvre participated in it. So the issue is only the accepting of an interpretation of Vatican Council II.

The SSPX is not obliged to accept an interpretation of Vatican Council II based on implied errors and false premises with no reference text from the Council.

The Prefect of the Congregation for the Doctrine of the Faith( CDF) implies that there are deceased saved in invincible ignorance who are known exceptions to the dogma extra ecclesiam nulla salus. This was implied in the interview with the National Catholic Register when he was asked about extra ecclesiam nulla salus.

There is no text in Vatican Council II which says those saved in invincible ignorance are explicit and visible to us and that they are known exceptions to the dogma on exclusive salvation.

There is no known case of salvation outside the Church. The CDF Prefect cannot name any such person in 2012.So the SSPX is not expected to affirm what is implied and assumed and is not a known fact in 2012.

The CDF Prefect has to imply that Lumen Gentium 16 contradicts the dogma - the text makes no such claim.

The SSPX could accept an interpretation of Vatican Council II which is traditional. This interpretation would be the only rational interpretation.It would be in accord with their position on other religions.-Lionel Andrades

The Secretary of the Congregation for the Doctrine of the Faith implies that the Letter of the Holy Office 1949 corrected Fr.Leonard Feeney for doctrine and being in heresy.The text of the Letter does not state this.
So the SSPX is not obliged to accept that Fr.Leonard Feeney was excommunicated for denying being saved with implicit desire or invincible ignorance.
The controversial text in the Letter could apply to disobedience and discipline and not doctrine and heresy.Liberals and dissenters have 'pulled a fast one' on us.
http://eucharistandmission.blogspot.it/2012/11/the-secretary-of-congregation-for.html#links

Archbishop Muller and Di Noia identify the premise of the visible dead in the interpretation of Vatican Council II
The SSPX is not obliged to accept something which is implied and is not part of the text of Vatican Council II.
The SSPX is not obliged to accept that there are known exceptions to the dogma when no one at the Vatican can name a single case in 2012.
http://eucharistandmission.blogspot.it/2012/11/archbishop-muller-and-di-noia-identify.html#links