If it were real, that'd be an incredibly dangerous thing to do--even with a life preserver vest--and a physically taxing one, as well. Neither of which Trump would be doing.
I mean, drowning is kind of the least of your worries in those situations.
NEVER walk through even suburban flood waters unless it is life or death. Because you know those things called "sewers"? Yeah, they are under there. And if the water has reached the point where it is even a foot off the ground? Then those sewers are entirely(-ish) full and that "water" contains significant amounts of poo, medical waste, chemicals, and so forth. Let alone corpses of animals... and people.
So that is basically liquid hepatitis and Erastil knows what else.
It is also why you NEVER buy a car that has been in a flood area and houses really should be basically demolished at that point (but aren't because Capitalism).
You would be amazed what people flush down their toilets
You do realize there are other people in that flooded area too, right? Those "missing" folk? Hopefully all of them show up at a Waffle House two counties over. The reality is... many of them are still there in that horrific soup.
It’s not about flushing them but I would imagine that graveyards that are below sea level have the bodies in mausoleums and many of those you can walk into so it would not surprise me that places near the ocean might have a rotted corpse.
A sealed casket is buoyant. If a cemetery is flooded, caskets, especially of the recently deceased with disturbed soil, are known to rise through the soil and then dump their contents (bodies) into the floodwaters.