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Correct me if I'm wrong, but as far as I see it they're simply talking all fancy and engineering-like about stalling the wing, but in effect all they're doing is filling a low pressure area with air from a higher pressure area, thereby reducing the drag (and it certainly sounds like this was their goal).
I think whether it's a wing or not is slightly irrelevant for drag reduction purposes. It just so happens that since they're F1, have a lot of equipment and knowledge, it pertains to the rear end of a high downforce wing.
I think the idea does have merit, but whether or not it can be accomplished with significant improvements on an every day vehicle will depend on how much 'free' space one might be able to find without increasing the FA.
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