Yes, and if the Church taught different than it did then, that would be a serious contradiction and departure of belief. If that was true, I cannot see anyone, in good conscience, remaining Catholic.
.
It looks to me like the Church has changed her teaching on this:
In addition to the Council of Florence, we have other declarations:
Pope St. Pius X, Acerbo Nimis (# 2), April 15, 1905:
“And so Our Predecessor, Benedict XIV, had just cause to write: ‘We declare that a great number of those who are condemned to eternal punishment suffer that everlasting calamity because of ignorance of those mysteries of faith which must be known and believed in order to be numbered among the elect.’”
Pope Gregory XVI, Summo Iugiter Studio, May 27, 1832: “Finally some of these misguided people attempt to persuade themselves and others that men are not saved only in the Catholic religion, but that even heretics may attain eternal life… "
St. Augustine (+426): “Consequently both those who have not heard the gospel and those who, having heard it, and having been changed for the better, did not receive perseverance… none of these are separated from that lump which is known to be damned, as all are going… into condemnation.”
Pope St. Gregory the Great, quoted in Summo Iugiter Studio, 590-604:
“The holy universal Church teaches that it is not possible to worship God truly except in her and asserts that all who are outside of her will not be saved.”
Pope Clement VI, Super quibusdam, Sept. 20, 1351:
“In the second place, we ask whether you and the Armenians obedient to you believe that no man of the wayfarers outside the faith of this Church, and outside the obedience to the Pope of Rome, can finally be saved.”
Pope Paul III, The Council of Trent, Can. 2 on the Sacrament of Baptism, Sess. 7, 1547, ex cathedra: “If anyone shall say that real and natural water is not necessary for baptism, and on that account those words of Our Lord Jesus Christ: ‘Unless a man be born again of water and the Holy Spirit’ [John 3:5], are distorted into some sort of metaphor: let him be anathema.”
However, now it is taught differently, that a Jew or Buddhist can be saved. And in the case of the Jew, it is said that he can be saved by the Old Covenant.
Actually, there are a lot of other areas where the Church has changed her teaching, perhaps under the idea of development of doctrine, so it should not be too surprising.