you haven't been duped. far from it. Miami invests millions a year in continuously pumping water away from beach front property, They have upgraded all draining systems in the last few years. Its very likely the project you were talking about was taking that into account already. There are several interviews with miami's mayor where he discusses at length what the city is doing regarding rising water levels.
I just came back from Miami last night and indeed, rising ocean levels sure is a hot topic all over Florida. Driving to Key West and back on Friday I witnessed first hand the road being practically at water level in many places, where it used to be a couple feet higher 100 years ago. Add some stormy winds and chop into the mix, and the road is easily flooded.


Sea levels around Miami are rising at an alarming rate of about an inch per year. The causes are quite complex and complicated, both natural and man-made, but make no mistake, carbon levels in the atmosphere are the main culprit - there is plenty of scientific evidence to support that finding.
IMO, whoever still believes that 7.5 billion humans all over the world with their industries and footprint don't influence the climate must be delusional or living in denial.