I edited my original comment to add pictures from an actual Taco Bell that I took in person.
$28 could get you well over 4,000 kcal of food, so I think my comment that it is an “obscene amount of food” is correct.
The crunchy taco supreme is kind of a notoriously bad deal though. 50% more money for maybe 5 g of added ingredients. If you take a look at the regular tacos at NYC prices, nine tacos plus tax totals $26.36. If you add one of the strange cheese wraps or another small item that would probably bring you to just over $28. Still, nine tacos provide 1530 kcal, which is not obscene, maybe just “filling”. But note that nobody would actually only buy nine tacos straight, there are other things that would provide more calories or even just more food mass that are more likely to be bought on a binge-eating trip. Notably, the potato taco costs less but has 240 kcal, which is 41% more calories. The combos also come with a drink which could add several hundred calories and up to a kilogram of mass to the meal (1 refill of an 18 oz cup is about 490 g of mass assuming soda has approximately 90% the density of water).