Can you point me to where Irenaeus points to one single tradition not found in Scriptures; or that the traditions he alludes to come orally and not verifiable by Scriptures?
Yes. Nowhere does it say that everything He passed to us was written down; in fact, John 20:30 that you cite, and John 21:25 say the opposite.
Well that says a lot. Your statement tells me that those traditions not found in scripture are superfluous "for doctrine, for reproof, for correction, for instruction in righteousness." Because John clearly stated: " But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name." What's more than life through Jesus Christ?
So am I to understand then, based on your defense of John 20:30, you are agreeing that there are other traditions taught which were passed down (obviously orally since we have no record written from the Apostles) but did not meet the standard of Holy Spirit Inspired Scriptures? Yet, we have Jesus Christ, John and Paul telling us what we need for understanding God's plan of salvation, righteousness and holy living are all contained in Holy Scriptures.
and John 21:25 say the opposite
John 21:
25 And there are also many other things which Jesus did, the which, if they should be written every one, I suppose that even the world itself could not contain the books that should be written. Amen.
Indeed. Please list those things so important they did not make the cut? The Gnostics made such claims as well.
The criteria for inclusion in the scriptures was apostolic origin, direct record of events related to Christ and absence of contradiction. Massive body of work was produced by the Fathers of the Church at about the same time the scripture was canonized that for one reason or another was not canonical scripture. Irenaeus's work is one example.