The catch is that this is a tiny lab prototype, where the energy density is projected and I could not find it in the paper that the cycling was in fact tested for 1000 times and even though the starting materials are cheap the article is very light on details about mass manufacturing larger cells. I don't want to take away from the research and think it's super cool and hope it scales well to mass production but it's usually a long road from lab prototype to Tesla level production facilities.