Alpacas/llamas have a different foot type than most of your grazing animals. Cows and sheep have hard, cloven hooves that tear up the earth and kill vegetation like nobody's buisiness.
Alpacas and llamas have feet like a camel. That is to say, a comparatively soft hoof, which is really only the tips of the 'toes.' The rest is soft, leathery pad. Much less destructive.
With that said, for an arid climate (Texas) the hard and fast rule is supposed to be 6 alpacas per acre. I have no idea how many acres the Tranch has, but I doubt it's enough for 200+ animals.
They're constantly short on money and have grossly over-populated their land. Why don't they save on feed bills and fund their venture by selling all these crias? I wouldn't even give them shit for doing the name auctions and THEN selling the crias, because if someone's stupid enough to burn their money naming a farm animal someone else owns then they deserve what they fucking get.