They can't. The Divided Scourges & Hench-workers Local 106 (Balrogs, werewolves, ludicrously big spiders, fellbeasts, revenants, wargs, aquatic horrors, trolls, and orcs/trolls/ogres) are boycotting the show for gross misrepresentation, insisting they're "unapologetically evil."
wtf really i assumed they hired an actual balrog