Much of the listed commentarial literature has dates—or tentative dates—attached to it. It is important to remember that those dates only refer to when the texts that we have now were written down in the form that we know them. Much of the material is older and was handed down aurally for a very long time. Much of this material was handed down from the time of the Buddha and/or from still early times when Arahants abounded, as Robert points out here:
And:
Anytime we see a date attached to a text, we must understand that we have no idea how long the material in the text had been handed down by mouth before it was committed to writing, and no idea how many times it had been re-copied from previous versions of the text before what we have now was created. I suspect that at times the prior texts may also have not been listed as originals because they may have been inferior productions in terms of grammar, hand-writing, materials used, scribal errors, etc. (not every scribe is wonderful), or because the version we know may have been copied by a well-known and respected Commentator, while the writers of the previous texts may not have been as well known.
The ancient world simply worked very differently than our own. I remember when I first read The Odyssey in high school. At the time I simply assumed that what I was reading was a version written by Homer himself because it was his name that was on the cover. I didn’t learn until many years later that most scholars think the Iliad and the Odyssey were not written down until somewhere between 200 and 400 years after their original composition! But that is not the whole story. After the Hellenistic period, the text of Homer continued to be copied and studied in the Byzantine Empire. The manuscripts produced during this time, particularly from the 9th and 10th centuries CE (with changes from the “originals”), form the foundation for what we actually have today. This means that from the time of Homer’s composition (c. 750 BCE) to the creation of these complete manuscripts (c. 950 CE), nearly 1,700 years had passed. That is the version of Homer that we read today. Mind-blowing.
When we study the works of our Theravāda paramparā, we should understand that the knowledge handed down to us is ancient.
R