I take my own words back. I am the person who reported that specific usb adapter working on nintendo's discussion board.
It seems like that Nintendo didn't even go through the trouble of taking a new USB ID. They just pick one company that makes the thing and use the existing number.
Don't buy it from the page you refered to. It is clearly over priced. It is $12.99 from fry's. And one week ago I found someone on ebay selling it for $5. If you really want one that will work and don't care about paying extra, I'll sell you mine for $30 including shipping.