That's exactly what the paper says. >This comparison suggests that the likely upper level of sea level projections in recent IPCC reports would be too low. Th

That's exactly what the paper says. >This comparison suggests that the likely upper level of sea level projections in recent IPCC reports would be too low. The onclusion: >We compare the model projections over the 21st century assessed by the IPCC with historical records from 1850–2017. We find that the model projections assessed in both AR5 and SROCC fall substantially below an extrapolation of historical records (Fig. 2). .... >Taken together this suggests that the projected global sea level rise by the end of this century in various IPCC reports is at best conservative and consequently underestimates the upper bound of what is referred to as the likely sea level rise by the end of this century.