As someone who has been dealing with Chinese LED vendors for the better part of a year, be very wary of knock-off items such as these. There seems to be a whole sub-set of Alibaba vendors who seem to do nothing other than look for hot-selling items, grab some images from the original retailers website, figure out the unique search terms associated with the products, and post them on their own pages with a low-ball price. What you receive from them could be anything - including something that may have no resemblance to the item as pictured or specified. But by then, your money is in China, and returning a $100-200 order will be financially untenable. This is basically the business model for scores of Alibaba vendors, especially those promoting low or no minimum purchase amounts.
In this instance I know personally that this manufacturer has never produced authentic Quantum Boards. I also note the info on the LED brand used is listed as "Samsung/Epistar". Since there's no joint Samsung/Epistar branded LED chip, you can bet you'll get Epistar diodes, at best. Caveat emptor.