At the MIT affordable housing design competition there were some entrants that had similar features. (pre-fab sections, erected on site relatively rapidly) By pre-wiring/plumbing the walls and floors you cut out a lot of things that slow people down. Having watched Hotels get built in Las Vegas really rapidly (for them, which is 18 months, ground breaking to opening night) you could see there are lots of things that can be disrupted. Staging carpet for example, when you start carpeting its rolls and rolls and rolls of carpet, lifted by crane to various floors, and later cut to order. If you install the floor with all the carpeting already installed at the factory you've managed to parallelize floor construction and finishing. That is a huge savings.
This building will house 31,400 people, (@ 11M sq ft that is like 350 sq ft per person so not really roomy) But an interesting way to throw together shelter. Building these things for Haiti could do wonders for that country, assuming they don't burn down.