The thing about EBMM and JP is this - whatever JP wants is what gets made. At one point that if he decided he preferred 10 gauge strings, the factory put 10s on all the JP guitars. If he changed his mind and preferred 9s, the factory put 9s on the guitars. In fact in general with EBMM the guitar that gets made and that we buy in the stores is identical to what the artist really uses, whether it's a Luke, Morse, Albert Lee, Petrucci, Valentine, or St Vincent. And no changes are made without their OK. When recent limited editions of the Luke, Morse, and Petrucci were offered with maple fretboards, they all gave their thumbs up first.
So the answer to your question is almost certainly this: JP wanted a Floyd Rose with no piezo on the JP16 and that's what's being made.