I believe there’s another reference in which Paul’s scriptures are acknowledged. Anyhow, good catch. And this is how any small-o orthodox Christian church would treat the bible writings, whether erroneously or correctly.
2 Peter 3:15b. As also our beloved brother Paul wrote to you, according to the wisdom given him, [16] as in all his letters, speaking concerning these matters, in which some things are hard to understand, which those who are untaught and unstable twist to their own destruction, as they do also THE OTHER SCRIPTURES. [17] You then, beloved ones, being forewarned, watch lest you also fall from your own steadfastness, being let away with the delusion of the lawless.