User blog comment:Umbralis/Nasus - Benevolent or malevolent?/@comment-3974211-20131129110950

Skins are not canon.

Also, the "canon" of Infernal Nasus is an alternate reality/future/past/whatever. Similar to how Blackfrost Anivia is an alternate Classic Anivia where she succumbs to Lissandra's corruption. They aren't related except by what distinguishes them.