“Ok - so which Epistles count? Does 2 Peter specify them?”
Peter was writing of all of Paul’s epistles. He does not need to specify if one is scripture and another isn’t, since all of the Apostles had the authority and the inspiration to be scripture producers, just like the Prophets of old who put together the Old Testament.
So you admit then that it doesn’t give a list of authoritative Epistles from Paul the Apostle.
So where do we get this list of Corinthians, Galatians, Ephesians, Romans, Colossians, Thessalonians, Timothy, Titus and Philemon from?