saw this. the interesting thing is how little they figured about the drop in the cost of renewables. In engineering school they taught you how cost scaled with equipment size, but the idea that there was predictable curve for cost of technology vs production scale of that technology wasn't on any one's bingo sheet. Today it's a well developed idea in tech engineering/forecasting with correlated parameter values for various techs.
We always knew it was true at some level - We always knew to build the engine in your Buick as a one-off would cost a hundred times what it cost GM to build a million of them per unit, but the idea that the same idea applied to technological progress as a whole, that innovation was also a function of scale, hadn't really stuck.