If you watch the video, they explain that they are all designed to be moved if the owner wants to, just like a mobile home. They are in just mobile homes but with more attention paid to aesthetics.
They can be movable without being mobile homes (any house is movable, it’s just a matter of how easy they are to move!). Legally, they definitely aren’t classed as mobile homes, they aren’t permanently attached to a chassis. You can probably get a mortgage for them, for example.
