[Iscool]

In fact, when Paul wrote his second letter to the Thessalonians, he urged Christians there to receive the oral and written Traditions as equally authoritative.

No he didn't...You are misquoting the verse that you even posted...

The verse does NOT say oral and written traditions...It says, oral OR written traditions...

We can't pick one or the other...

We are to receive the tradition whether it was spoken to us from memory, we heard it being read to us or we read it for ourselves...It's all the same tradition...

So, then, brethren stand firm and hold to the traditions which you were taught by us, either by word of mouth or by letter. (2 Thess. 2:15)

[NKP_Vet]

“either by word of mouth or by letter”

Translation: Tradition AND Scripture.