This is typical of Protestants. When this verse is cited--that clearly shows Tradition is equal to Scripture in authority---which means that by definition, Sola Scriptura is unscriptural--the Protestant then changes the subject and asks "What are these traditions?"
While "What are these traditions" is a good question, right now it isn't relevant. YOU, sir, as a Protestant, claim that Scripture is the sole infallible rule of Faith. YOU, sir, as a Protestant, claim that the apostles and Jesus were Sola Scriptura Christians.
In the very passage your are citing, Paul refers his people to the oral tradition suggesting that this oral tradition is as authoritative as Scripture. That being the case, Paul did not follow Sola Scriptura, which means Sola Scriptura is unbiblical. Paul referred the Christians to something other than Scripture that they were to look to. Thus, Sola Scriptura is not scriptural. Protestants look only to Scripture.