Never heard of that stuff
But Les' Recipe for airbrush thinner with Citadels is Liquitex Matt Medium, Liquitex Flow Aid and Distilled Water.
Personally I use the Airbrush Medium that you were looking for, and its great. But the matt medium with flow aid might be a good substitute (not tried it personally, but les' wash recipe is great, and I've no reason to doubt him at this point)