Yes exactly. This seems to be replacing the part that was never a problem (building walls) with something high-tech and surely expensive. The nozzle that depos

Yes exactly. This seems to be replacing the part that was never a problem (building walls) with something high-tech and surely expensive. The nozzle that deposits that concrete is just guaranteed to be much more fussy about quality control than the guys shoving it into moulds to make blocks. So it'll need high-quality materials transported from somewhere, not whatever is lying around.