No sale.
He needs to have available information that explains things like compressor maps, flow numbers rather than bullshit pressure readings, some kind of explanation for how he handles the bearing lubrication issue - oil in a supercharger being self contained is one thing, but turbo style compressors spin several orders of magnitude faster - and hopefully some pictures, dyno results, and real customer testimonials. A price list wouldn't hurt, either.
Until then, all he has is a shiny website with lots of claims. I could make one of those over a weekend.