The catholic church views the Bible in the same way God-hating, leftist bureaucrats view the U.S. Constitution: they claim it is the ultimate authority in the land, but turn right around and claim it's a "living" document subject to their interpretation and modification, which renders them, not it, the ultimate authority, not matter what they claim.
Likewise, the official position of the catholic church is that "the Magisterium is not superior to the word of God, but its servant". How, then, can that be the case if the Magisterium is able to define, determine, and interpret the Scripture in the first place? Moreover, the Magisterium seems to “discover” doctrines that are not consistent with the original meaning of Scripture itself—e.g,, the immaculate conception, purgatory, papal infallibility and the like. Thus, despite these declarations from Rome, residual concerns remain about whether the Magisterium functionally has authority over the Scriptures.