"As the designated custodians of the inspired word of God, they knew which books were canonical, and which were not, and they knew this without the assistance of the yet to appear Catholic Church."
And the Jews did not agree among themselves, and when the High Priest sent down translators to Egypt to translate the Scriptures into Greek, his emissaries translated the Septuagint, which includes those books. The Jews didn't have a particular, specific canon. They used Septuagint, mostly. Some used Hebrew texts. There were variations. The Essenes' Hebrew texts reflect the language of the Septuagint, when it differs, much more often than the Massoretic Text (which wasn't compiled until several centuries after the Christian era).
You're not hanging your authority about what Scripture IS on Scripture at all. You're hanging it on a perception of Jewish authority. But the Jews had no canon, and the Septuagint translation was the only one made for general use when there was still a high priest sitting in the Temple in Jerusalem. The Massoretic Text was not solidified, because it didn't NEED to be (given, in effect, the "Vatican" of Judaism reposing in the High Priest and the Sanhedrin) until the Temple was destroyed and central authority was shattered.
You cite Revelation. Yes, that particular prophesy is closed. But "this book" refers to that particular writing, Revelation. It was not written as part of the Bible - there was no Bible when it was written. "This book" doesn't mean the Bible. It means the Book of Revelation.
Obviously the statement of "nothing to be added" in Deuteronomy is not to be taken to mean for the whole canon. because that would exclude Joshua and everything else that came after.
When Jesus say: " till heaven and earth pass, one jot, or one tittle shall not pass of the law, till all be fulfilled." Was he referring to Hebrew or Greek text?
jot or tittle: "Jot" refers to yôd, the smallest letter of the Hebrew alphabet; "tittle" is a slight serif on a Hebrew letter that distinguishes it from another, similarly formed letter.