And Pope Gregory decided otherwise in the 6th century:
"With reference to which particular we are not acting irregularly, if from the books, though not Canonical, yet brought out for the edification of the Church, we bring forward testimony. Thus Eleazar in the battle smote and brought down an elephant, but fell under the very beast that he killed" (1 Macc. 6.46). (Library of the Fathers of the Holy Catholic Church, (Oxford: Parker, 1845), Gregory the Great, Morals on the Book of Job, Volume II, Parts III and IV, Book XIX.34, p.424.)
Cordially,
Nope. Pope Gregory expressed an OPINION--not an infallible teaching. The telling point is that despite this OPINION, the Canon as established by the earlier Pope and councils was not changed, and Macabees remained in the Bible.