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@lae
The website specifies a cold gas inflator, same as is used on curtain airbags in cars. A car's main airbag will generally use either a propellant, or a chemical reaction to give off a massive volume of gas, or both - just did some research and as far as I can tell, a cold-gas inflator definitely doesn't contain propellant, but probably works by producing gas via a chemical reaction. This is probably why it takes a relatively long time to deploy (0.1 seconds) compared to the main airbags of cars (something like 0.03 seconds).
The point is moot, though, because in either case the inflator is a one-use unit. I'd still say the main barriers to re-use are the fact that the 'airbag' probably can't withstand multiple re-inflating, and that the electronics can't withstand repeated crashing.