The robot is a tool, it does one specific task, and a task that is only one small part of a trade. It's actually surprising to me that you don't seem able to grasp that concept. What the house building robots in the youtube videos are doing is about 10% to 15% of what goes into a home.
I assume they could design a home and have it broken down into a series of tasks a bunch of robots could perform, but the entire system would have to be mobile, or the homes all made out of sections that can be assembled on site. Perhaps a hybrid of the two. Mobile homes are probably at the forefront of that industry right now.
Should they ever invent a robot that can actually build a complete home, I'll be the first one in line to buy one.