It is good to post the quotes in context....from your source
v • d • e Rabbinic Judaism recognizes the 24 books of the Masoretic Text, commonly called the Tanakh or Hebrew Bible. Evidence suggests that the process of canonization occurred between 200 BCE and 200 CE. A popular former theory is that the Torah was canonized circa 400 BCE, the Prophets circa 200 BCE, and the Writings circa 100 CE,[1] perhaps at a hypothetical Council of Jamnia, but this position is increasingly rejected by modern scholars.
The Book of Deuteronomy includes a prohibition against adding or subtracting,[2][3] which might apply to the book itself (i.e. a "closed book," a prohibition against future scribal editing) or to the instruction received by Moses on Mt. Sinai.[4]
The Book of 2 Maccabees, itself not a part of the Jewish canon, describes Nehemiah (around 400 BCE) as having "founded a library and collected books about the kings and prophets, and the writings of David, and letters of kings about votive offerings" (2:13-15). The Book of Nehemiah suggests that the priest-scribe Ezra brought the Torah back from Babylon to Jerusalem and the Second Temple (8-9) around the same time period. Both 1 and 2 Maccabees suggest that Judas Maccabeus (around 167 BCE) also collected sacred books (3:42-50, 2:13-15, 15:6-9), and some scholars argue that the "Jewish biblical canon" was fixed by the Hasmonean dynasty.[5] However, these primary sources do not suggest that the canon was at that time closed; moreover, it is not clear that these particular books were identical in content to those that later became part of the Masoretic text. Today, there is no scholarly consensus as to when the Jewish canon was set.
Primary sources for the "Hebrew Bible Canon" are listed in McDonald and Sanders's The Canon Debate, 2002, Appendix A.[6]
In other words Scripture tells us when there was a canon.. but scholars are disagreeing on it
I'm not seeing that in what you quote -- I see references to holy books (not listed) but no indication that the OT Jews even had a notion of canonicity in the required sense.