Letter of the Holy Office 1949 to the Archbishop of Boston contradicts the Catechism of Pope Pius X

The Letter of the Holy Office 1949 to the Archbishop of Boston contradicts the Catechism of Pope Pius X.

 Therefore, that one may obtain eternal salvation, it is not always required that he be incorporated into the Church actually as a member...-Letter of the Holy Office 1949

While the Catechism of Pope Pius X says the opposite.

16 Q. Is Baptism necessary to salvation?

A. Baptism is absolutely necessary to salvation, for our Lord has expressly said: "Unless a man be born again of water and the Holy Ghost, he cannot enter into the Kingdom of God."

The Church in Particular

9 Q. State distinctly what is necessary to be a member of the Church?

A. To be a member of the Church it is necessary to be baptised, to believe and profess the teaching of Jesus Christ, to participate in the same Sacraments, and to acknowledge the Pope and the other lawful pastors of the Church.

24 Q. To be saved, is it enough to be any sort of member of the Catholic Church?

A. No, to be saved it is not enough to be any sort of member of the Catholic Church; it is necessary to be a living member.

27 Q. Can one be saved outside the Catholic, Apostolic and Roman Church?

A. No, no one can be saved outside the Catholic, Apostolic Roman Church, just as no one could be saved from the flood outside the Ark of Noah, which was a figure of the Church.

11 Q. Who are they who are outside the true Church?

A. Outside the true Church are: Infidels, Jews, heretics, apostates, schismatics, and the excommunicated.

13 Q. Who are the Jews?

A. The Jews are those who profess the Law of Moses; have not received baptism; and do not believe in Jesus Christ.

14 Q. Who are heretics?

A. Heretics are those of the baptised who obstinately refuse to believe some truth revealed by God and taught as an article of faith by the Catholic Church; for example, the Arians, the Nestorians and the various sects of Protestants.

-Lionel Andrades