That’s bullshit. I also live in south FL, and this is not only uncommon, it’s very much not a solution to flooding. The most common flooding you’ll encounter during rainstorms is a few inches deep in the worst case, and even a lambo can drive through that no problem. If flooding is at the point where you’d need such a high suspension, you’re not going to drive through it anyways because you can’t see what hazards there are under water, and you’re not going to risk damaging your very expensive toy.
This is just someone with an undiagnosed mental and/or urological disorder who has too much disposable income.
You sound like you’d enjoy an apocalypse very much.