Oral things handed down, like divine revelation were taught to Timothy, doctrinal instruction, authoritative teaching. The point being Paul does not mention anybody or anything that he should look to for help in teaching or mattesr of faith, the Holy Spirit was there for him, not some organization.
Tradition from fallible, corruptible men or God breathed Scripture, not a difficult choice.
The whole reply to question 331. above shows that there is indeed an authoritative body ("organization") that teaches, of which St. Paul is a member.