This might boil down to the fact the PGC does not know about the correct coordinates and hence can only use the original coordinates (from the listing) to compute the elevation. I am not entirely sure whether PGC will use corrected coordinates to determine the elevation once they are present, but I think it does not. With that in mind, it won't be possible, unfortunately, as the original location is at 2408m and that's the only one PGC knows about.