You're overly restricting the definition of skeuomorphism, or perhaps confusing it entirely with anachronism. Wikipedia's definition of skeuomorphism is a design element that is retained as an ornamental imitation of a formerly functional counterpart. When a notepad app wastes screen space on drawing non-functional spiral binding, that's definitely skeuomorphism.
You're right, that is skeumorphic. And many other things Apple does are too.
However, that doesn't mean every thing -- like the leather stitching in "find my friends" -- that Apple does involving natural textures is skeumorphic.
