I'll offer a slight quibble with "random" being the opposite of "regular." I'd say the opposite is "irregular." And, to me, that is slightly more vague than random. I think I could argue that renting out one of your contracts every other year, at different times, to different people, at different resorts is "irregular," but I think I'd have a harder time arguing that it is "random." To me, "random" would imply no discernible pattern whatsoever, whereas "irregular" could have some degree of pattern or consistency, but if there are enough differences between rentals, you could argue that it lacks the degree of sameness to be characterized as regular. And, the me, Disney is intentionally using vague terms here because it gives them the maximum amount of discretion.
Of course, if it ever went to court, a judge might require Disney to come up with come more concrete guidance in order to enforce all of this, but, as others have mentioned, this is unlikely to end up in court. And, on the off chance that someone actually wanted to challenge this in court, one could easily see Disney settling to avoid a judge making a ruling and to continue giving them maximum discretion.