Do you know how many square meters of surface water is in all of the seas? This big chunk of ice would just go bloop and nobody would notice.
Regarding the ocean: 139.5 million sq. miles (361 million square km.)of ocean cover the earth's surface.
At two feet of rise and 640 acres per square mile you would have (640x2) x 139.5m = 178,560 billion acre ft. of water.
and going further: 325,000 (rounding off) gallons per acre foot, gives us: 58,000 Trillion gallons
The comment is beyond absurd.