Sea level rise predictions have the most uncertainty of any climate predictions. We can estimate pretty confidently what the equilibrium level of ice will be fr

Sea level rise predictions have the most uncertainty of any climate predictions. We can estimate pretty confidently what the equilibrium level of ice will be from a given temperature from the geologic record, but how quickly we get there depends on a lot we don't fully understand about the physics of ice sheets. One study like this probably shouldn't change your perception of our state of knowledge of this that much, but your baseline should also be that there's huge uncertainty.