Yes, exactly, Premium Guard (which is Interfil) is a reseller of (predominantly?) offshore whitebox products, with contracts with manufacturing facilities in various parts of Asia.
It's a bit like buying a store brand of something, except that in this case, the store brand is a re-brand of the reseller's product, who also distributes that same product under their own name, so there's another "layer" so to speak.
They could be made like this for all we know, lol
These ones even have the bright red ADBV: