Earlier quoted context omitted.
According to NASA [1], global sea levels have been rising at a fairly steady 3.2 millimeters per year since 1993. According to NOAA [2], the "relative sea level trend" in Miami Beach is 2.39 mm/year. At those rates, in 100 years, the sea will have risen about one foot, not six. 1: https://climate.nasa.gov/vital-signs/sea-level/ 2: https://tidesandcurrents.noaa.gov/sltrends/
Only if that rate remains steady, and it very well may not.
https://www.sciencedaily.com/releases/2018/02/180212150739.h...
That accelerating projection "has the potential to double the total sea level rise by 2100 as compared to projections that assume a constant rate -- to more than 60 cm instead of about 30".
Two feet instead of one. I still don't see where six feet is coming from.