Tests have shown that a winter tyre is capable of stopping a car in a shorter distance on a flooded road in temperatures at 4 degrees C, than what a summer tyre can. Perhaps part of the compound being softer, allowing the tread blocks to move and generate more heat, also helps them disperse the water more effectively, thus raising the point at which the car aquaplanes.
I don't think it being suggested that a winter tyre wont aquaplane, just that they might be able to cope with higher levels of surface water before they do and that they offer more grip to help regain control of the vehicle afterwards, compared to a summer tyre.
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