Did you see another video about this? The one linked only showed the walls and still showed them doing interior framing. Nothing about windows, electrical, plumbing, insulation, etc.

What they showed could speed up construction but there are tons of other steps involved.

I do wonder how sturdy it is since it doesn’t look like rebar or anything else is added.

Since when is a 300 person company a startup? I feel like you lose any claim to that long before you hit 100.