Ok do this. take a glass of water and put a large rock at the bottom. Then fill with ice. Let the ice melt. What do you see? It is the exact same displacement. Go try it.
“Ok do this. take a glass of water and put a large rock at the bottom. Then fill with ice. Let the ice melt. What do you see? It is the exact same displacement.”
Your analogy is flawed. Fill a glass of water. Place a screen on top of the glass. Place a large ice cube on top of the screen so that when it melts the water drips into the glass. What would you see?