That's the description of Cardinal Mayer's offices through the years. The rest of the list are bishops and archbishops, not full cardinals.
There's been some vague speculation that the first non-Cardinal since 655 years might be elected pope, in which case there are a whole lot more Benedictines to choose from, and bishops of Jewish origin, and even at least one Benedictine of Jewish origin. We shall see!
The benedictine thing is a claim and tradition of the benedictines themselves, perhaps because they are also called "olivetans". The author of the prophesy himself never said it would be one of them. I have also heard it said that the original prophesy only listed 111 popes, and that 112 was added in an edition long after his death.