Given it is a Ron Ben Israel cake I am going to assume it is a mold. He uses them quite often.
As to where to buy a mold like this. I have no idea. But I'm sure others will chime in real soon and can help you with that part.
In looking at that cake I do not think that the scrolling is a plateau at all. I looks as if the cake is sitting up on a riser (probably styrofoam) and that scroll molds were used and applied to look like a plateau. The cake is actually sitting on a white board with ribbon around it and the scrolls do not appear to have any pressure being applied to them.
In looking at that cake I do not think that the scrolling is a plateau at all. I looks as if the cake is sitting up on a riser (probably styrofoam) and that scroll molds were used and applied to look like a plateau. The cake is actually sitting on a white board with ribbon around it and the scrolls do not appear to have any pressure being applied to them.
Looks that way to me too. Even if it's not, that's certainly an option to achieve the same look at much lower cost.
She's actually asking about the plateau.
And know RBI, he might have had it specially made. I've never seen anything like it.
I was thinking about the edging around the cake, duh! 
But given what the others have said, possibly it could be sitting on something else and those are made of sugar paste and molds. It certainly makes one think outside of the box. 
One more thing. What if the ribbon is actually wrapped around Styrofoam or some other cake stand like thing. (I can't remember if Styrofoam is a no no or not). Then you could wrap the ribbon round and set it in the cake plateau and put the cake on top.
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