Where did the water to make the ice come from, and once it melted, where did the water go? There's not enough water on earth to make that much ice. Glaciers never form uniformly, either. The coldest areas would have thicker glaciers than the warmest areas. These 'scientists' didn't give much forethought to the article.
“There’s not enough water on earth to make that much ice.”
Actually there is... Much of it is in the atmosphere at all times.