to a mobile home.

This is intriguing.
Here's the FAQ page:

https://www.boxabl.com/faq

If they can build a 20X20 unit they certainly can build a 20X10 unit that could make "tiny houses" redundant.

I didn't see the name of the manufacturer (I was dumb-founded by the video) but I'd love to be able to support them and help them get the message out.

This is something that could really help the homeless problem. Brilliant idea and tech.

but this is the sort of thing they're going to need in the intial rebuilding of any catastrophic disaster zone where everything has been leveled. Live in one room for a while, add another module when you can afford it/when it becomes available because basic needs in the area have been met.

Yeah, it's real. It's also kind of a riff on the tiny house ideal of reducing space to the barest minimum. People with teenage children would probably kill them in one of these if they had to put up with it for a long time.