That site is a fake Chinese counterfeiting operation - stay away. As a general rule of thumb, EQT jerseys are not faked, but as Billsfan says, you will receive a shoddy, fake "authentic" jersey and not an EQT. The main giveaway is the poor English and grammar. Just have a read through the following section of the website and decide for yourself if it seems to be a reputable company which you'd give your "blank" (bank) details to: http://www.authenticcowboysjerseyshop.com/faq.html
There are a lot of these fake "team" online stores popping up from China. I would only trust the NFL.com store or the Cowboys store linked directly from the official Cowboys website as being legit team shops.
On another note, I'm not convinced that you will find a DeMarco Murray EQT or authentic without having one customized. I may be wrong, but I thought that Reebok did not make retail authentics and EQTs for rookies - especially not third round picks.