I built my house using insulated concrete forms (ICF), which work just like giant foam lego blocks that you fill with concrete after assembly. They're already in wide use and have been for decades. The material described in this article is different. I can't judge whether it's better, but ICFs work pretty darn well. Their big downside is that you get a very strong, very well-insulated concrete house, but it costs a lot of money to make a concrete house, and unless you live in a hurricane or tornado area, you might be better off building a flimsier house.