Am I wrong to assume this probably uses something similar to an Aluminium–air battery that is essentially non-rechargeable?

It would be nice if Gizmag redaction did some facts checking before publishing articles promoting Nunzio La Vecchia. Although flowcells do exist, their performance is nowhere close to the claims described here.
I recommend googling a bit about the guy. The discussion on this page provides plenty of links to past and present scams of Nunzio La Vecchia: http://www.teslamotorsclub.com/showthread.php/28239-NanoFlowcell-Quant/page3

Amazing figures are quoted, but no technical explanation. And what is different between this and the Koenigsegg Quant featured back in March 2009 ?

Sounds good - pull into the supermarket instead of the servo ... "A kilo of salt please, oh, and can I use that outside tap?" BUT - I can see the price of salt soaring as Big Govt spots the popularity, just like our supposedly cheap diesel soared in price.

if it were true,what good would it do if it were out of reach of 99.99% of new car buyers?

More details, this article: http://www.gizmag.com/900-hp-supercar-flow-battery/31091/.

I agree the big deal here is the flowcell. If it actually performs as claimed it would be at least 20 times as efficient as the next best competitor that I have seen. With an over powered 900hp machine like this, a range of 375 miles would need something like 200kwh. They claim to get that from a tank that can fit in a motor-vehicle. The best "salt-water battery" I've seen has nowhere even close to that density.
So I will be eagerly watching to see if the rubber does indeed meet the road on these cells or if it is as Hovnimrsk Prdelac pointed out.

It's not "salt water powered" at all. But most of us knew that.

nickel metal hydride batteries are coming soon the pattent that the oil company Texaco bought and then suppressed the large format versions (LF) for last 15 years runs out at end of 2014. 1. Charges from 40%-80% in ONLY 15 min, 2. If operatedonly within the 40%-80% can last decades according to Toyota 3. Range over 120 miles with only 14 LF batteries as shown in EV1 4. Some news (owned by super rich oily persons) have already started anti NiMh "stories" saying they pollute landfills; not mentioning that Ni is so valuable that is recycled when finally they need it. 5. Ask why the frantic fear of this the only LF battery prevented from the market, surely the would be as afraid other batteries Unless this one really is that good. 6 Rav4 EV'S from 1998 are still onthe road with original NiMh batteries!

Is this process cheaper then H2 fuel cell mode? Mass produce for use worldwide, awesome