If you actually watch the video, you will see the machine adds fibreglass rebar already automatically. Also you will see that the exterior walls are printed hollow so you can spray foam inside them afterwards (basically the same concept as ICF except it is 3D printed).
Yes, the framing, siding, and roofing is not the only part of building a house. Obviously you still have interior work to do after the fact. However, it is a very significant portion, and this machine can do all of them in 24 hours (have a bigger house? Use 2 or 3 machines to keep it at 24 hours...). When was the last time you saw a house framed, roofed, and sided in 24 hours? You can't even assemble a factory-built home on site that fast... I know cause I have one.