All glacier ice extending into the sea, when it breaks off Antarctica can never raise sea levels as it floats on the sea.
People seem to not understand that. Ice melting off land can do that as that is not supported by water and then it enters water. Ice shelfs coming away from land are sea ice regardless of origin. As they exist on the sea , sea level simply level is as it is and won't change
Floating ice melting does nothing, although it might make the sea colder as it melts. You can see that by filling a glass with ice, note the water level and let it melt. All ice shelfs could break free of land and not raise the sea an inch higher. It would though make it colder farther from Antarctica.
