No, because I'd need to know what part of the techniques that are used to assess global sea levels is called into question by the rebound.

Given that it appears to be a fairly well-known geological phenomenon, I find it really hard to believe that nobody who pays attention to the sea levels had thought of this yet. Therefore, the mere existence of rebound does not lead me to question the conclusions - I'd also like to see evidence that it has a serious potential to muss up the data and has not been accounted for.