All their assumptions are false, but I like to record when physics people have the nerve to publish. However, they left out the fact that ice over water does not raise sea levels. It's like having ice in your drink -- buoyancy rules.
I like the ice modelling. I used to do that, the question being what is the maximum shear stress that ice can exert on rock, and it depends on steepness and total height. I concluded that it didn't matter because it was the water pressure that cracked rock.
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