This applies to ice that is floating freely in the ocean, or an ice cube in a glass. The ice shelf is, or part of them are, but the glaciers that feed into the ice shelf are not. These are flowing off the land and into the sea. So, depending on a lot of other factors, they might add to sea rise.
One factor is the water cycle. If we experience global warming, more water becomes vapor and may wind up as snow on the Antarctic, or rain over Africa. Lets hope for warming!
Sounds like global warming will create more arable land for growing crops.