I read some paragraphs of that link, and was interested to see that in a lot of places, there is a lot of repetition of the words and phrases, with appropriate variations.

I am guessing that it was a technique that was used to reinforce the learning by the listener, similar to how the Vedas and other ancient Indian scriptures were passed on by making the student repeat them a number of times and memorize them, because they were no modern things like books, and maybe even palm leaf manuscripts came sometime later. That's what I've heard, anyway, from parents and relatives.