For your consideration ...
Are we assuming that ice which breaks off the ice shelf never melts or something? The sea level is up over 10cm in 28 years and that's an objectional fact. 28 years is a fart in the wind.
Well, the definition of ice shelf: "An ice shelf is a large floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface."
An ice shelf is already floating, continually being fed by glacial activity, its displacement, (any breaking off), is already accounted for. So zero net rise in sea levels.
About 97 percent of Earth's water is in the oceans. Of the tiny percentage that's not in the oceans, about two percent is frozen up in glaciers and ice caps. And less than 1% of water is in the air.
Now, even if all the ice caps were to melt, (ice caps being ice above ground), there would only be a negligible increase in sea levels.
The Earth is, and stays in, balance at all times.