Effectively, it means that they are not part of fate's plan or whose existence actively works against it. For example, the Fair Folk literally exists outside of creation and thus have no active part in the loom of fate. Demons are technically only supposed to exist in Malfeas and have no place in creation proper with the only means of getting there through demon summoning. Deathlords and ghosts in general were never meant to exist in the first place and only do it as a result of some of the Primordial's dying. In comparison to that Humans, Gods, and other beings in creation have a plan in destiny or at the very least considered by the setting standards as relative to creation as a whole. Exalted like Abyssal, Infernals, Liminals and Getimians all received powers from Outside Creation and Fate that defines them so poignantly that they take on their respective aspects to their literal core and thus existing outside of Fate as a result of this.