Whilst putting up a building at speed is a great marvel, it should be noted that what holds this kind of prefabrication back is not generally technological innovation but the reality that transporting prefabricated components to site is often more expensive than just building them in place. If this ever really gets built and isn't one giant PR excercise ('tallest building' proposals have a long history as such), it will require a huge factory space of temporary workers not far from the base of the building basically doing all the usual building tasks and won't be any cheaper than a traditional slow concrete construction which requires long times to dry (unless they are hiding something more fundamentally important than the headline from us).
I was under the impression it was mostly regulation holding prefabrication back (presumably less of an issue in china). Here in the UK many (admittedly somewhat low-quality) prefabs were built immediately after the war to replace lost housing, and it was seen as the way forward - then they suddenly became illegal once they were no longer such an obvious necessity.
