I worked for Pulte shortly after they purchased the South Florida homebuilder Divosta. A 3d printer needs to overcome many of the same hurdles Divosta encountered. Among these is that the pace of construction is determined by capital investment in equipment and so seasonal and cyclical variations in demand cannot be accommodated efficiently by scaling capacity up or down quickly relative to conventional construction.
Furthermore, the article takes a naive view of a construction schedule:
"It would build the house in such a way that you’d only need to put the windows and the doors in the cutouts that have been left by the huge construction robot."
If there are no windows or doors, a building isn't dried in. That means that domestic equipment and finishes (e.g. Kitchen appliances, gypsum celings, most types of flooring, and trim) are not yet installed. And the process of finishing a building takes more than half the time.
Now, one might argue that the system is intended for places requiring basic shelter such as poverty stricken areas of the developing world (thereby avoiding finishes) All I can say is that the history of high tech construction systems in such places does not lead me to be optimistic. Lack of infrastructure and cheap labor tend to create market conditions favoring other approaches.
Manufactured housing was an ongoing project throughout the last century, and an optimized solution was found. Unfortunately, it is the drop dead unsexy house trailer.
[Edit] After watching the video, it is clear that the system requires a specialized concrete mix - one with very low slump in order that a freshly deposited layer does not just flow off the top of previously deposited layers.
This makes conventional delivery via truck from batch plant more difficult. Low slump mixes tend to have proportionally shorter working times making traffic delays or delays on the construction site lead to higher waste by the mixer truck load. In addition specialized mixes require additional coordination by the batch plant.
In addition, the environmental impact of concrete is high in terms of greenhouse gas emissions compared to wood or steel.
