A Satanic Panda said:
Well, Earth's mass is ninety nine percent metal or metal oxides. So all the water on earth makes up less than one percent of that total mass. From that, you could expect to have a solid chance of avoidinng water.
It just so happens that the less than a percent is in a gas and fluid film covering that has total and seventy percent coverage respectively. Suddenly, your chances are not so great...
But the idea of 'all the water' being in one spot is hilarious, maybe that was the alien's logic?