Well, I find the use of “then” more obviously incorrect. But I’m not sure I agree that your comparison is right. It’s talking about energy generation, which is

Well, I find the use of “then” more obviously incorrect. But I’m not sure I agree that your comparison is right. It’s talking about energy generation, which is a common unit of measure and is dependent not just on how much energy is available from the wind and sun but also on the efficiency of converting it to usable electricity. Or am I missing something? Assuming it’s not vaporware, which I agree is a stretch, I think another issue is not all roofs can accommodate these things. It looks built for flat roofs of significant size and probably strength. That said having wind and solar provides a joint probability distribution that reduces the amount of time you need battery storage - but not enough to do without.