When you mentioned Grand Designs, I was expecting a link to the FACIT [0] house! I suppose that's CNC or cutting/routing based though...
I have to say, it's an interesting design. I have my reservations about portions of it though. Insulation of recycled newspaper makes me very uncomfortable with the idea of what happens if it catches fire. That said, it's just one small aspect of the whole I'm uneasy with so far (but I haven't watched it all).
It reminds me a little of an old Grand Designs episode. [0] Different, in that (AFAICT) the 3D-printed house isn't designed to have high thermal mass (the 'earthship' concept) but it gives an idea how a fully-functional house can be crafted from a lot of earth and work quite well.
[0] https://www.granddesignsmagazine.com/grand-designs-houses/97...