I don’t accept their “fudge” but the seas have been rising since the last glacial cycle ended because of ice melt and thermal expansion of water. The point I am making is that the thermal expansion of water hasn’t changed in 6,000 years.
Your use of "last glacial cycle" is proof you are completely lost.
Earth ice
90% on Antarctica
7% on Greenland
0.3% on Ellesmere Island (Canada)
The overwhelming majority of Earth ice is on land near an earth pole. And land moves.
Two subjects for you to check.
1. North American ice age
1 million years ago NA had ice age glaciers down to Indiana, and indiana still had glacier ice 10k years ago. That ice melted. Tectonic direction of NA = SW.
2. Search for ancient Greenland green
Digging through the deepest Greenland ice and scooping up ancient pine cones dated 400-800k years ago. 1 million years ago, Greenland was completely green save mountains. Tectonic direction NW but pushed also SW by arctic ocean growth.
During the past million years, greenland FROZE while North America THAWED all at the same time on the same planet with the same atmosphere with the same amount of co2 in the atmosphere.
Ice ages are continent specific. Ice ages begin when land gets within 600 miles of an Earth pole, where the summer sun is insufficient to melt the snow, which then starts to stack.
Antarctica has 70 million year old dinosaur fossils, because 70 million years ago AA was not on South Pole...