[Disclaimer: I am not a member so I could only read the first few paragraphs of this piece. Apologies in advance if I am discussing something already covered by it. AT]

I would not be so worried about rebound, especially in Antarctica. Rebound involves astenosphere flow under the crust. So while Antarctica will rise, the ocean floor surrounding it will sink proportionately.

This will be partially the case with Greenland as well.

Still it is important to include this phenomenon as accurate predictions are important.