[BluffTHIS!]

In the church, canon law primarily is about obedience and the correct way to do things. And the pope is the supreme legislator in this. Thus his canonical opinion is always right since canon law really doesn't deal with doctrinal matters.

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as the authority of one Pope does not supersede the authority of another at any point in time

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This is simply untrue. No ifs, ands or buts. The current pope has the final say in matters of canon law and liturgical practice not having to do with doctrine. His predecessors cannot bind him in that, only on doctrinal matters infallibly decreed. And Pius V's institution of the Tridentine Mass was a canonical liturgical decree. Surely you see the logical circle you put yourself in by asserting otherwise since obviously Pius V changed one form of the Mass himself into another.

Thus canon law is necessarily not in error when the pope defines it to mean something not to do with doctrine, which canon law isn't about. And one of the fundamental principles of canon law is that all legislation is to be interpreted according to the mind of the legislator.