“It’s always been my understanding that the NK military is well fed.”
And with good reason (think about it).
Meanwhile, the rest of the country requires food donations from other countries.
WHO gets the food?
The recruits themselves are badly damaged by the time they make it into the active military, and little can be done to fix it at that point, even if there were ample food supplies.
It's true that they get the lions share of the resources, but they're far from 'well fed' by any reasonable definition.