Eh. It says Battlefield Voucher Redemption For the PS3 right at the top of the screen. So at most people waste 5 seconds going there to find out it's only the PS3 version that gets the game.
Unless someone sees your post and is trying to decide on the 360 or ps3 version knowing they might sell out soon. They may not have time to look at the site before saying "Hey, if it's free then I"ll get the 360 version" :P