This system has been publicized on the press
i have a pdf of the magazine which I can post
Of course it's in Greek, but it will be a proof.
It's no hoax. The mag says that the development was made on a Renault 19 Energy (1989 model) and the carbon monoxode emissions were cut down to 1/40th (from 1,8% down to 0,05% - even on a cold start they never went above 0,1, e reduction down to 1/20).
The idle was down to 350 rpm. There is even a possibility to de-activate some cylinders.