I think I can add a little context to what seems like nonsense. There are coastal homes that are uninsurable and at risk everytime there is a severe storm. If the location is desirable enough, don't expect that deep discount written about in the article to be guaranteed.
It is not uncommon for homes "on the sand" to net 25+% per year as a short term rental. These houses offer a unique experience that is very difficult to own and guaranteed to not be available for much longer. If an owner can show that they are consistently pulling high net returns, then selling the home (even for cash) is not that difficult. They are, however, playing russian roulette with the money they have tied into the property. Eventually someone is going to lose that game of hot potato and get wiped out.