I'm not suggesting that you should buy from these guys, but I would venture to say that you probably won't receive a fake or knockoff product if you did.
GP Acoustics, the HK-based company that owns KEF, manufactures loads of consumer electronics and other products for the Best Buys of the world. The reality is, loads of manufactured products get dumped into the secondary (grey) market for reasons that have nothing to do with product quality. Stores close, merge or can't pay their bills. Maybe some distributor took a boatload of product in order to get a higher discount on certain items and dumped the rest. Maybe there are factory seconds; generally cosmetic blems.
If you pay via CC or PayPal you will almost certainly not be harmed financially in the off chance that you don't receive what you think you ordered.