Is this how run flats work?
Nope, that is something new and wouldn't work to well if you suddenly hit a bolt that punches a huge hole in the tire. Run flats have what looks like a cage? sort of thing that keeps the tire "up" for X amount of miles (depending on the design and the speed). What you posted will help keep you from losing pressure due to temperature changes for those that find it to hard to check that manually then add some when it happens. Maybe keep the tire from going flat due to very slow small leaks.
Sidewall reenforced

big rubber thing on the wheel that you roll on (military goes with this type)

images stolen from google images and whatever site they are actually on.
Sidewall reenforced

big rubber thing on the wheel that you roll on (military goes with this type)

images stolen from google images and whatever site they are actually on.



