There's also a "Deus Vult" mode, which enables "crusaders" to enslave all "Saracens" (read: Muslims), and a WWII-era mode in which Germany can be governed by, um, Taylor Swift in full Nazi regalia. It's hard to understand why some lonely racists get off on imagining a notoriously liberal lipstick blonde pop singer ruling over them with an iron fist while dressed in full leather- oh wait, now we get it.
Hearts Of Iron IV isn't the only title that's gotten an Aryan makeover. Stormfront-affiliated gamers have produced mods like Stormer Doom, a Doom mod in which you get points by shooting Jews (and Bill Clinton), and a Counter-Strike mod that changes your heroes' clothes to neo-Nazi regalia. They've also spliced a white-male-only "Euro-Solarian Empire" into the space exploration game Stellaris.
There's even a "wish list" section on the Stormfront forums hatching plans for future mods. This includes a version of Fallout 4 that introduces segregation between the white and black bombed-out shacks, and rewriting the lore in Skyrim to make it about white supremacy -- apparently forgetting all the Scandinavian types in this game are whiners who put dark-skinned people into ghettos and lost every war they started. Sounds pretty true to life, though.