Parent is writing about Antarctica, the ice sheet is not floating but would be replaced by air which is a lot less dense. And the land rising effect is certain

Parent is writing about Antarctica, the ice sheet is not floating but would be replaced by air which is a lot less dense. And the land rising effect is certainly there, its well known from our norther hemisphere where satellite measurements have tracked for quite a while now how i.e northern Europe still rises in comparison to the southern parts due to the not being covered by the ice age glaciers anymore.