I'm not sure about the idea but it doesn't strike me as stupid as a perpetual motion machine. An iceberg has part of the water it's displacing above the water

I'm not sure about the idea but it doesn't strike me as stupid as a perpetual motion machine. An iceberg has part of the water it's displacing above the water level, so transforming a given volume of water into one should lower the overall line even without carrying it on land... Also the iceberg is white and won't absorb heat as much as the raw ocean. It's not clear to me if it's possible to create this machine using less energy that it's offsetting by the albedo change.