I would normally agree with you, but just look at where the usb cable is plugged in the OP and compare it to the first picture you linked. Its hard to tell in your picture, but the cable on an FC700R plugs in under the keyboard in the middle like this:
Show Image
(http://static2.insales.ru/images/products/1/1088/16606272/12.jpg)
Hm ok. I don't think it's a custom though. Typically pro-SC2 players don't use customs for whatever reason. This thread (http://www.reddit.com/r/starcraft/comments/1myybt/innovations_new_keyboard/) is guessing he's using a WASD V2 TKL which makes more sense to me.
Edit: Conveniently, a WASD V2 TKL just popped up in the Spy with some decent pictures for reference (http://geekhack.org/index.php?topic=52374.0).
I found this picture from DH Bucharest:
Show Image
(http://cdn.aceresport.com/media/uploads/2013/09/dreamhack_bucharest_2013_day_2_0005.jpg)
where you can pretty clearly see orb keyboard feet. WASD keyboards have feet that look like this:
Show Image
(http://www.wasdkeyboards.com/media/catalog/product/cache/1/thumbnail/492x/040ec09b1e35df139433887a97daa66f/v/2/v2-87-bottom_1_1_4_1.jpg)
You can also see a striped look to the case of his keyboard, which makes me think it is a custom with an acrylic case.
Of course, it is possible he switched keyboards again since DH Bucharest, but I find that unlikely. You can kind of see a bit of a striped look in the second picture of the OP, but that could be due to the quality of the picture.
Whoa! Never seen his keyboard at that angle. I'm totally out of guesses. Never seen feet like that before lol. And I don't think it's striped like you said. Just how the picture was taken.