> Besides the curious absence of the word 'sortition'.
Do you mean in common use? Wikipedia has a nice page on that [1]. There are also many papers on that [2].
[1] https://en.wikipedia.org/wiki/Sortition
[2] https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=sort...
The person just never says the word sortition. Its ends up feeling strange because it means either the person is trying to make this concept seem more their own, or they are that unaware.