I read the Article and it is not quite correct. The fact is that centuries before the council of Trent the Catholic Church had already determined the books of the Deuterocanonical books were authoritative.
The Council of Rome in 382, the Council of Hippo in 393, The Councils of Carthage in 397 and in 419, Nicea in 787, Florence in 1442, and finally Trent in 1546.
As far as Jerome he did have disagreements with Augustine with regard to the inclusion but did accept some of it and in the end entered all the Deuterocanonical books into his Latin translation known as the Latin Vulgate and not as an Appendix. Jerome subjected himself to the Catholic Church.
Also you are still faced with the issue of which books? It is clear that the Jews at the time of Jesus categorized the scriptures in to two categories i.e. the Law and the Prophets, however, there is no way to determine which and how many books that are fallen outside those categories were included.
Your view of a settle canon at the time of Jesus is not so certain. "To be candid: before the Bible, there was no Bible. Before the beginning of the second century CE, there were Jewish scriptures whose forms were still in flux and many scriptures were excluded in the finalization of the Hebrew Bible. Prior to the second century there was no way of knowing which scriptural books would be included within the collection and which would be left out; nor was there any way of knowing how the final version of the individual books would appear...Jews and Christians used numerous scriptural texts that never made it into the “canon”; and the forms that later became biblical books were in an extraordinary state of fluctuation between the third century BCE and the second CE...we must recognize that the Hebrew Bible editions in our hands today, those based on the medieval Masoretic Text, do not represent the “original text” of the Bible. The greatest modern authority on the Hebrew textual
tradition puts it bluntly: “One thing is clear, it should not be postulated that the Masoretic Text better or more frequently reflects the original text of the biblical books than any other text.”
Law, Timothy Michael. When God Spoke Greek: The Septuagint and the Making of the Christian Bible (p.19, 20, and 23). Oxford University Press.