That's not what he said, you twit. He wrote, "At current melt rates, the Greenland ice sheet would take about 13,000 years to melt completely, which would result in a global sea-level rise of more than 21 feet (6.5 meters)."
So, you got it exactly wrong. Ransom acknowledges that there is some melt and it does to a small degree contribute to the sea level rise.
Do you often misquote people when all one has to do is scroll up and read? Typical. But, honestly, Jason II is reporting 1.16mm/yr..... how scary is that? Can't you guys find something more realistic to wet yourself over?