You're equivocating "skilled" in the same way the OP of this comment chain was to "unskilled". You're doing the equivalent of saying "a feather can't be dark, because feathers are light." Stop playing stupid semantic games.
In the context of labor metrics, "skilled" and "unskilled" are not descriptors of overall difficulty. I've already posted a reminder of what the terms mean in this context above your comment, so there's no excuse.