I think it's mostly that overbuild is usually referring to capacity, and they've multiplied the generation. I'd guess this works out roughly the same if you ap

I think it's mostly that overbuild is usually referring to capacity, and they've multiplied the generation. I'd guess this works out roughly the same if you applied his scaling factors to the current capacity. His 25% rooftop solar would be around 200% capacity given a 12% capacity factor.