Thanks for the link. One statement from the paper: "this analysis assumes a static coastal topography".
This seems like a significant limitation, especially when a lot of the affected area consists of river deltas (eg, most of Bangladesh, the Mekong delta in Vietnam). One would expect that a rise in sea level in a delta would lead to increased silt deposition on the newly-submerged parts of the delta, reducing the impact compared to a naive calculation, perhaps quite significantly.
This seems like a significant limitation, especially when a lot of the affected area consists of river deltas (eg, most of Bangladesh, the Mekong delta in Vietnam). One would expect that a rise in sea level in a delta would lead to increased silt deposition on the newly-submerged parts of the delta, reducing the impact compared to a naive calculation, perhaps quite significantly.