>the amount of labor being generated per person has not really changed, but the overall pie has grown massively around us
I don't see where the article made that claim. Are you making it yourself and can you support it? That sounds like something that would happen when technology improves. What the article does do, is pose a question that it never answers: "When the labor share falls, it means that productivity, prices, or both [which?] are growing faster than wages."