Yu Nakajima uses Rubiks.com DIY. Then again, the package on that cube said Rubik's, I dunno. Pop an edge out of the mirror blocks, spray (not too much, or it will become loose and lockupy), put edge back in, scramble/solve.
Are you sure that he used the Rubiks.com DIY, because it could just be that his stickers are the western rubik's stickers, because I heard the JSK came with those stickers for a while.