The "watercooling-powered backplate" appears to be an acrylic reservoir. There are a few threaded inserts for tubing fittings on the backplate. You can see red and black wires attached to the backplate in the third photo which I would guess are to power LEDs. The front of the card is the waterblock plus aluminum fins and fans. It is likely very similar to what Asus did on their Poseidon cards. The waterblock on the front has a few threaded connections on the end piece that you can see in the third photo. This is where you would attach barbs at tubing for the GPU. There is likely a pump buried somewhere under that monstrosity of a 3-slot cooler or inside the silver block on the end of the cooler.