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The conclusion that our planet doesn't have enough water to submerge all the land is based on the assumption that every landmass will remain at the current altitude.
A water planet is still possible if for some reasons all the landmasses sink below the water level. We don't actually know how many years in the future we are or what kind of catastrophe happened, so this isn't completely impossible. Albeit it is very unlikely and I doubt this anime will actually provide such justification.
What I was actually trying to say is that when an ice age ends the temperature should simply return to normal levels. Here however it seems that it became even higher, and that means that another event must have occurred to cause all that, an event that most likely the old Earthlings didn't predict and couldn't predict when they left.
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