Thank you. Let me do some simple math with the numbers your source provided:
Total area of ice sheets, North and South = 6M Sq Mi
Total surface area of earth = 200M Sq Mi
Total surface area of water on the earth = 140M Sq Mi
Percentage of ice sheet area to total water area = 4.3%
For 4.3% of the earth’s surface to produce a combined total of 220 feet of sea level change would require an ice sheet with a average thickness of 5,116.2 feet.
That is significantly thicker than the thickest known ice shelves in Antartica (around 3,000 feet), but average thickness is less than half of that. It most certainly is much less that the artic cap.
I rounded figures conservatively, and you can apply earth’s curvature instead of figuring in linear miles, but that only makes the numbers worse for your argument.
"The Greenland ice sheet (Greenlandic: Sermersuaq) is a vast body of ice covering 1,710,000 square kilometres (660,000 sq mi), roughly 80% of the surface of Greenland. It is the second largest ice body in the world, after the Antarctic Ice Sheet. The ice sheet is almost 2,400 kilometres (1,500 mi) long in a north-south direction, and its greatest width is 1,100 kilometres (680 mi) at a latitude of 77°N, near its northern margin. The mean altitude of the ice is 2,135 metres (7,005 ft).[1] The thickness is generally more than 2 km (1.2 mi) and over 3 km (1.9 mi)"
From NASA (lima.naza,gov)
"Antarctica is the highest, driest, coldest, windiest and brightest of the seven continents. It is roughly the size of the United States and Mexico combined and is almost completely covered by a layer of ice that averages more than one mile in thickness, but is nearly three miles thick in places."