Maybe he's taking a leaf from the Elder Scrolls where the identity and deeds of famous heroes are always confusing and obscure because you gotta reconcile the fact that the Champion of Cyrodiil or the Nerevarine or the Dragonborn could have been from any race and any gender.
But here it doesn't make sense because there's only one canonical Dominic Deegan and only one canonical Luna. There isn't an alternate canon where Dominic is an Argonian.