I dunno...
On the one hand, it might possibly (and I am going out on a limb here) be a rather novel form of heterogeneous charged combustion. That is, a pocket of stoich air/fuel mix is developed within a homogeneous mixture of much leaner air/fuel mixture, and the result is burned within the combustion chamber. The stoich pocket reliably ignites, and reliably burns the rest of the mixture inside the chamber. Modern cars with direct injection can do this easily.
On the other hand... Well, there is the question of the procedure used to test this claim. I am pretty skeptical right now.
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