There's a YouTube channel, "My Little Homestead" where a family builds various house-additions and structures out of stucco-covered dirt-filled sandbags.

Dunno how that sort of construction technique pans out long-term or large-scale but you could get the sort of floorplans the GA generated out of it.

You have to build formwork to construct with in-situ concrete, so there's still carpentry (or equivalent) involved.

It's a good point that existing architectural concrete 3d printing creates "mass concrete" not reinforced concrete, but mass concrete can be structural.

These guys are building small houses with a thing that prints in layers just like a home 3D printer, using mortar instead of plastic. https://www.youtube.com/watch?v=wCzS2FZoB-I It looks like there's manually placed metal mesh for reinforcement.

Dunno what the quality's like, but it's there. It does seem like it would be tricky to scale to structures larger than the practical footprint of their printer, but maybe the thing could be mounted on wheels.