This was on my brother in law's engine. The rod was still connected. This is a common issue with this engine, and a liquid cooling failure is suspected as the main issue in this case.
I'm surprised a cooling failure caused that. Just from where it broke I would have expected some type of stress from the rod. Maybe not enough to break the rod, but to destroy where it connects.
I know it is hard to see in the picture, but where the connecting rod connects has no damage. The damage is limited to the skirt and the piston ports.
By the way, this particular engine model is known for piston skirt failure. The added stress of the failed cooling system was probably the straw that broke its back.