2 Thessalonians 2:15: “. . . hold the traditions which ye have been taught, whether by word, or our epistle.”
We are supposed to hold to Apostolic tradition that we have been taught by word or letter. That's easy to do.
For some reason, the Catholics twist the the idea of Apostolic tradition to mean that tradition is oral. The previous verse clearly states that Apostolic tradition was spoken and was written. The Apostolic epistles are a settled matter. The Bible commands us to teach and to preach. The measure of an Apostolic tradition is how well it lines up with scripture. There is no other sure footing.
2 Thessalonians 3:6: “Now we command you, brethren, in the name of our Lord Jesus Christ, that ye withdraw yourselves from every brother that walketh disorderly, and not after the tradition which he received of us.”
From the first verse, we know that Apostolic tradition was spoken and was written. The church received the tradition from the Apostles in word and epistle. The written traditions are clearly Apostolic. The oral tradition must be in accord with scripture or it has little value.
Sorry, not even close. The NT is full of references to oral teaching of the apostles that we have no reason to believe was written by them. The NT endorses and relies upon the authenticity of a spoken sacred tradition. You’re stuck with it.