These greenhouse designs make so much sense to me - the first time I saw this I was amazed I'd never considered how poorly standard greenhouses fit our use case up here. I worked on a farm for years growing up and we heated about half of them at least through December. Single or double ply plastic sheets and corrugated white plastic siding nailed to stick frame walls on the ends. Garage doors only on either end. I can't imagine how much that cost to heat.
It's that one-size-fits-all-just-burn-more-gas approach.
I'm actually just finishing up a winter scene featuring two of these, set into a south-facing hillside.