The New Testament has many books that were obviously written much later... including all of Paul’s Epistles that were written between 50-66 A.D.
How does Paul write to the Church in Corinth (among other places) if the Church needed the Canon of the New Testament in order to exist?
There is a fundamental chronological flaw in the original argument.
There is no such thing as a canon of any scriptures. That is just one of the many self promoting lies of the catholic abomination.
The various kelia spread around the Mediterranean had no need for a “new testament; they needed guidance on how to live by Yehova’s commandments in the scriptures that they already had, the same ones that Yeshua quoted from, in the Torah scrolls that they all had from the time that their congregations were born.
In short, they needed “The Way.”
Paul’s letters, written in Hebrew by necessity, were those instructions. He wrote far more letters than we have preserved today, judging by the comments of early church leaders, but we will do with what we have until Yehova sees fit to reveal more to us.
There is no chronological flaw.