I agree, it feels like NASA has been thrown in to create a veneer of respectability for these conclusions. NASA does publish regular sea level assessments (https://climate.nasa.gov/vital-signs/sea-level/) so perhaps that's where this has come from. Nothing in their current reporting suggests that they would have jumped in the 90's from "sea levels are rising" to "countries are going to be wiped off the map tomorrow". It is still fair to say, however, that there are countries that are going to be significantly/existentially impact if the current trend of sea rise continues.
Within any scientific discipline there is a broader consensus and there are more bold exceptional claims on both the high and low points. One could safely argue the consensus view on this topic has been moving too slowly.
Within any scientific discipline there is a broader consensus and there are more bold exceptional claims on both the high and low points. One could safely argue the consensus view on this topic has been moving too slowly.