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Are there building codes that allow for full structures built with non-reinforced concrete?

Probably not. I wondered the same thing.

There are some codes that allow for fiberglass-reinforced concrete in certain applications but I don't think load-bearing walls are one.

If you read towards the end of the piece he admits he had to use rebar in the walls. That's not shown in any of the photos though.

I can't remember at the moment where I read it, but there is a university in the states that is going to attempt a full house 3D print with concrete with rebar in the print process.

EDIT: Found it! http://3dprint.com/12034/3d-printed-house-pool-ny/

"New York City architect/contractor Adam Kushner begins construction of the first ever 3D printed estate, which features a 3D printed swimming pool, 4-bedroom, 2400 square foot home, and more. The 3D printer which will be a modified version of Enrico Dini’s D-shape printer, will, if all goes as planned, eventually be able to automatically place rebar within the 3D printed house, as it prints."

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