What did Wayne Grudem mean by claiming that the canon was not "officially" decided until the Council of Trent?

In *Systematic Theology* chapter 3 "The Canon of Scripture", Wayne Grudem says > It was not until 1546, at the Council of Trent, that the Roman Catholic Church officially declared the Apocrypha to be part of the canon (with the exception of 1 and 2 Esdras and the Prayer of Manasseh). (This is on page 59 in the 1st edition.) What does he mean by this? He is certainly not unaware of the Council of Carthage (397), because he cites this just 5 pages later for its decision on the NT canon. However, the Council of Carthage's Old Testament canon includes all of the Apocrypha found in modern Catholic Bibles (except Baruch). Is this an oversight on Grudem's part? Or is there some qualitative difference between the decision of the Council of Carthage and the Council of Trent that makes the latter an official declaration while the former not? *Note:* Grudem also does not mention the Council of Rome (382) anywhere that I can find, which was the first council to discuss the canon and included the Apocrypha as well, but he may be following the scholarship which regards the canon list of the *Decretum Gelasianum* not to be genuinely derived from the Council of Rome. If so, then he would have no reason to mention it as no direct evidence of the Council of Rome's decisions exist.