Because that's the distinction being argued here: it's "a handful"[0] of probabilities, not the complete work.
[0] I'm not sold on the phrasing "a handful", but I don't care enough to argue terminology; the term "handful" feels like it's being used in a sorites paradox kind of way: https://en.wikipedia.org/wiki/Sorites_paradox
Because that's the distinction being argued here: it's "a handful"[0] of probabilities, not the complete work.
[0] I'm not sold on the phrasing "a handful", but I don't care enough to argue terminology; the term "handful" feels like it's being used in a sorites paradox kind of way: https://en.wikipedia.org/wiki/Sorites_paradox