That's a little bit like the way they've been making poured concrete grain elevators. Kind of cool to watch them go up.
Edit: Oh, no it's not. They're just talking about assembling prefab panels. You can already buy different kinds of those, with wiring and plumbing and insulation already installed. You can't print that stuff. I guess the only reason to use a printing scheme is if each panel is a unique shape, and only one copy of the building will be made. So it's pretty irrelevant to housing needs.
BTW: One of my neighbors was an engineer who owned a prefab building company in the city. Most of their stuff was pretty dull. But he would design stuff to please himself, for erection out here on his farm. (Mostly back in the 60's, before building permits were required.) But once a design was executed, he would loose all interest in it, and the final assembly usually never happened. He told me that he would erect them when he retired and moved back to the farm. (I used to do maintenance on their place when I was a kid.) But neither he or his engineer wife ever retired. Their old barn is still full of components for these houses. One of them is supposed to be round and pivots on a huge turntable bearing, so they can take in all the different views at the top of their hill. And there's a windmill for electricity, and other stuff. Now his son owns it all, and it looks to me like he's never going to retire either. Of course, none of that would meet code now.