Not to argue for arguments sake but I did pull this off from the web site you gave a link to.
When the vehicle is equipped with an on board refilling system, the refilling of its tanks can be carried out by connecting them to a domestic electric plug.
The moto- alternator, (used when the vehicle is running to retrieve energy during braking and decelerations phases) drives the air engine operating in ‘compressor mode’ to recharge the tanks.
That being said I don't know what the other manufactures are saying. This is the first time I have seen a concept like this, they very well could have some kind of staging system in these vehicles that could charge them off from an at home air compressor.
Additional edit: Just a bit of information I ran across, but apparently the ACEEE has rated the Honda Civic GX, which only uses compressed natural gas, as the greenest vehicle currently available, compared to hybrids and electrical cars and such, due to the incredibly clean burning of natural gas, and the low emission methods used to create it.
I allways have liked the idea of CNG cars. A lot of fleet company's used to use it but its not as widely use any more. CNG is great its burns clean and efficient. The only problem is the same as the fuel cell vehicles and these compressed air vehicles is that its a pain to fill.
I probably should have specified that the hydrogen tailpipe emissions is zero. It does take something to make the hydrogen. Last I heard GM is developing a refrigerator sized machine that produces hydrogen for at home fills. How this works I don't know.
The new hybrid technology that's on the market right now is pretty good too. The two mode hybrids that are out are a lot more fuel efficient than what was out even a few years ago. They actually power the vehicles with electric motors instead of having an electric assist, or the "golf cart effect".