My understanding... It freezes, but it doesn’t adhere. It flakes off easily.
The article states: “Due to the low adhesion between ice and shell, the smallest underwater flow can therefore wash off the ice again and the scallop does not freeze.”
That clearly says “the scallop does not freeze”. For your point to be accurate, it should state: “the scallop does not become covered with ice.” I believe your interpretation is probably correct and that the scallop likely has a lower freezing point than the water temperature. I was pointing out that the article is poorly written, or should have included more information about the temperature at which the scallop will actually freeze.