I think Yahtzee missed commenting on the obvious, or perhaps avoided it. The reason why they have so few tracks is probably not because Micky Mouse lacks talent as a gay S&M dominator and his legion of computer programmers/boy toys were as a result not working hoping he'd punish them better (or whatever sick thing Yahtzee was implying), but simply because Mickey realizes he can sell additional courses to the players, especially ones from this demographic, as DLC. Will you pay $5 for them to recycle art elements and let you drive down the same track in reverse? Will you pay $15 for three new courses? Well if "you" are the target audience for this game, like most "shooter" players the answer to this is probably "yes".
I'm pretty sure as Mickey has a bunch of well oiled, whip mark covered computer programmers resting in a form of contented fear in the cages he keeps in the dungeon under the Magic Kingdom Castle (in hopes Minnie won't find out), having produced plenty of maps that are simply being held back until Scrooge Mcduck tells Mickey that his analysis of the market dictates that it's the ideal time for a release.
Also you can now thank Yahtzee for scarring me for life, the image of a whip wielding Mickey (or at least a guy with mouse ears) lashing a computer programmer will cause me never to view him the same way again. The pain... oh god the psychological pain...