You forgot to quote the references:
Embracing Scripture as the rule in evaluating doctrines is a practice, thus it would not be expected to be TAUGHT. (VERY few practices are). It is not necessary that practices be EXAMPLED (illustrated) in Scripture (or we could not be chatting here on the internet) but the issues before us ARE thus illustrated. What is NEVER illustrated is a denomination being regarded as INCAPABLE of error, exempt from norming, and whatever it itself says just embraced with docility.
The Official, Historic Definition of Sola Scriptura: "The Scriptures serve as the sole rule and norm of all doctrine" (Lutheran Formula of Concord, Solid Declaration, 9). "We pledge ourselves to the prophetic and apostolic writings of the Old and New Testaments as the only true norm according to which all teachers and teachings are to be judged" (Ditto, 3). "The Latin expression "sola scriptura" refers to the function of the Holy Scriptures to serve as the sole norm (norma normans) for all that is officially confessed in the church." (Lutheran Church - Missouri Synod at official website)
Jesus DID embrace accountability and never exempted The Catholic Church. Scripture affirms accountability for teachers of doctrine. Just a very few of just NT verses on this: 2 Peter 2:1, Titus 2:1, 1 Timothy 6:3, Revelation 2:2, James 3:1, Matthew 13:52, Luke 20:46, Ephesians 4:14.
Sola Scriptura is the praxis (practice) of using Scripture normatively. While practices are SELDOM taught in Scripture, we sometimes see them exampled. They need not be to be sound and good (we're using the internet right now, there's no examples of such in Scripture) but Sola Scriptura is found all over Scripture. Here's just 50 examples of where Jesus uses Scripture normatively (Sola Scriptura): Matt 21:42 Matt 22:29, Matt 26:54, Matt 26:56, Matt 2:5, Matt 4:4l, Matt 4:6, Matt 4:7l, Matt 4:10, Matt 11:10, Matt 21:13, Matt 26:24, Matt 27:37, Mark 12:10, Mark 12:24, Mark 14:49, Mark 15:28, Mark 1:2, Mark 7:6, Mark 9:12, Mark 9:13, Mark 11:17, Mark 14:21, Mark 14:27, Luke 4:21, Luke 24:27, Luke 24:32, Luke 24:45, Luke 2:23, Luke 3:4, Luke 4:4, Luke 4:8, Luke 4:10, Luke 4:17, Luke 7:27, Luke 10:26, Luke 18:31, Luke 19:46, Luke 20:17, Luke 21:22, Luke 22:37, Luke 23:38, Luke 24:44, Luke 24:46, John 2:22, John 5:39, John 7:38, John 7:42, John 10:35, John 13:18, John 17:12, John 19:24, John 19:36, John 19:37, John 20:9, John 2:17, John 6:31, John 6:45, John 8:17, John 10:34, John 12:14, John 12:16, John 15:25, John 19:20, John 20:30, John 20:31, John 21:25. There are more, of course, and these are just SOME examples of the praxis from just Jesus the New Testament.
The following examples of the Apostles doing so: Acts 1:16, Acts 8:32, Acts 8:35, Acts 17:2, Acts 17:11. Acts 8:24, Acts 18:28, Acts 1:29. Acts 7:42, Acts 13:29, Acts 13:33, Acts 15:15, Acts 23:5, Acts 24:14, , Acts 13:46, Romans 1:2, Romans 4:3, Romans 10:11, Romans 11:2, Romans 15:4, Romans 26:26, Romans 1:17, Romans 2:24, Romans 3:4, Romans 3:10, Romans 4:17, Romans 4:23, Romans 8:36, Romans 9:13, Romans 10:15, Romans 11:8, Romans 11:26, Romans 12:19, Romans 14:11, Romans 15:3, Romans 15:9, Romans 15:21, 1 Cor. 15:3, 1 Cor. 15:4, 1 Cor. 1:19, 1 Cor 1:31, 1 Cor. 2:9, 1 Cor. 3:19 , 1 Cor. 4:6, 1 Cor. 9:9, 1 Cor. 9;10, 1 Cor. 10:7, 1 Cor. 10:10, 1 Cor. 14:22. 1 Cor. 15:45, 1 Cor. 15: 54, 2 Cor. 4:13, 2 Cor. 8:15, 2 Cor. 9:9, Gal. 3:8, Gal. 3:22, Gal. 4:30, Gal. 3:10, Gal. 3:13, Gal. 4:22, Gal. 4:27, 1 Tim 5:18, 2 Tim 3:16, James 2:8, James 2:23, James 4:5, 1 Peter 2:6, 1 Peter 1:16, 2 Peter 1:20, 2 Peter 3:16 Of course, during this time, The Catholic Church was not mentioned at all. For anything, about anything, concerning anything, in any context concerning any matter.
Norming is the evaluation of the correctness/validity/truthfulness of a position. Bob the Builder is hired by us to build a fence 6 feet tall. He's done and says it is 6 feet tall. IF truth matters to us, the issue then becomes: is it correct? Evaluating that is called "norming."
The first issue in norming is WHAT will serve as the Standard in such. This is technically called the "norma normans" in epistemology. It is the rule ("straight edge") or canon ("measuring stick") for norming. Let's say you and I and Bob the Builder all agree to use a standard Sears Measuring Tape as our canon (the word literally means "measuring stick" and comes from the epistemology of norming). We are all accepting accountability for the position (that the fence is 6 feet tall) and we are all embracing the same rule/canon/norma normans. We all have one, we all regard it as reliable for this purpose, and it is objective - knowable to all, alterable by none, above and beyond all parties involved.
In theology, accountability is also relevant because truth is. Thus norming is required.
Sola Scriptura is the embrace of Scripture as the rule/canon/norma normans.
The RCC rejects Sola Scriptura not because it has an alternative rule/canon (it doesn't) but because it rejects accountability in doctrine in the singular, exclusive case of it itself alone, requiring instead that all just accept whatever it says "with docility." (CCC 87) just as the Catholics in this thread are attempting to state and defend. It requires that it be given a complete, absolute "pass" on the issue of correctness and rather whatever it says just be embraced "with docility." To ME, this seems a lot like "with blindness" - and thus relevant to the issue of this thread. The RCC's position is blind embrace, exempting it from accountability.
No, the PRAXIS of using the Rule of Scripture in norming is not Tradition, it's praxis. No, it's not Lutheran since none of the examples here are Lutheran, they are all from Jesus and the Apostles. Now, contrast all this to self declaring self to be incapable of error and exempt from accountaiblity by any norm - exclusively if self is the specific RCC. I think you'll find this not only NEVER traught but NEVER exampled.