That is if things progress at the same rate. Ice melts at the same temperature, that temp has been reached at the foot of most Northern hemisphere glaciers, not a big difference to sea levels, but if the ice field in the Antarctic goes that is a lot more water than has come off Greenland, and when the temp gets there it will all go quite rapidly, don't think it is all going to continue, little by little, in the same way always. The temp rise might continue like that, the Southern ice will survive until it reaches melting point, then it will go quite quickly even though the temp rises at the same rate. I have seen various estimates, but the most conservative is about five meters rise in sea level, that is enough to flood most cities based on old sea ports, some estimates are much higher.
PS. he gives original sea level and present sea level, but does not say if the level rose constantly over that period, or if the rise is accelerating.