This site is based in China so it is 99% likely that the goods listed aren't genuine. They accept Paypal, which means they are probably safe to buy from, but just be aware that buying fakes opens up a whole lot of risks for you at Customs and if someone dobs you in on eBay. Worst case scenario you could be paying tens of thousands in fines and/or even serve a jail term.
By all means email the site and ask them for a certificate of authenticity, but even these are faked sometimes so you have to be very, very careful.