Is Dayan Guhong white DIY allowed in competition?

Can someone explain to me why it shouldn't be allowed?

I once quickly read through the rules and what I remember, is that the mechanical puzzle must be turnable and have 6 different distinguishable colors.
 
I white cube is not allowed in competition, neither is a black one, or any other colour for that matter!

But if you put stickers on it, anything but transparent is allowed.
 
I think he's trying to say that a cube in a solid color isnt allowed unless stickered, but I think that is rather clear though ._.
 
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