Pretty nifty. I think it could be developed to be a good fit with earth berm and underground applications although I disagree with the narrators thermal efficiency comments. Heating climates would benefit from some insulation on the exterior.
"If you want to save the environment, build a city worth living in." - Wendell Berry
Here's how I think you could make it happen: semi-rigid inflatable forms. Make a form that is basically PVC with an inflatable balloon. The PVC shapes the balloon and keeps it rigid. The balloon creates dome shapes required.