Sorry, but no.  I hate to be captain obvious, but chopping off limbs without any medical treatment has the effect of killing people.  How's your meat going to do in a rotting corpse?  Chopping off one limb at a time to "preserve meat" is about as unfathomably stupid as survival strategies get.  You kill the person, butcher them, and preserve the meat itself via smoking/salting/whatever.  
Likewise keeping your "livestock" in a dark, damp, basement with no sanitation, medical treatment or food is a good way to get your meat diseased.  Which can kill you.  As I've already explained.  Those cannibals would have been dead from their own stupidity long before Viggo and son encountered them (judging by the amount of shit they'd taken off their prey).
That wasn't survival cannibalism, it was stupid cannibalism that they threw in there for shock value.  Of no higher quality than that fake (but realistic) Internet video of a guy taking a hatchet to his balls.