I feel weird about edible artwork. Do I buy it for food or do I buy it as a piece of art? How many of it would I ever buy? Then there's also the added costs to both sides. It might be very niche.
If plating is ever a concern to you (which it almost certainly is) then in a way you already eat art.
The parent comment means "plating" as in the art/activity of arranging food on a plate [1]. Not, I presume, the manufacturing process of coating something with a thin layer of metal.