According to the TTGN news story that pointed me over to that link, the master was actually submitted by an independent artist. Ramshackle didn't commission it, they're just casting it and selling it. They're apparently willing to look at doing similar deals (you make a model, they make a mold and send you some copies in exchange for sales rights) for other people. Makes me think I should look into doing some sculpting myself.
And to be fair, this isn't the first 28mm scale take on that Epic model. Can't recall if it was Armorcast or someone else, but I can remember fighting against them back in 2nd edition 40K.