Is the geothermal heat weakening the sea plug that keeps the land portion in check? The timing seems suspect, is there new volcanic activity that explains this

Is the geothermal heat weakening the sea plug that keeps the land portion in check? The timing seems suspect, is there new volcanic activity that explains this geothermal heating? It's nice that there's an article in nature, but this is geology occurring under miles thick ice. I have my doubts that "geothermal heat flow" is responsible for threatening a glacier that can raise the sea level 10 feet.