Interesting. Although it also shows the author's unconscious bias: the article is all about how a lot of money might make you unhappy, but the entire story is built on the assumption that this "top" neighborhood represents What One Does With Money: one buys a giant gated toy palace, so that every possible form of entertainment is at one's fingertips, and thus one never needs to leave and be forced to interact with other humans (all of whom are, presumably, lesser, because they have not been as financially successful). That sounds like a recipe for misery at any income level.
Wonder what would happen if those people used that money to buy their freedom instead of mansions and toys? Would all of those who have already FIREd be less happy if their bank accounts suddenly had another zero or two on the end of it?
Of course money doesn't buy happiness; all you need to do is watch any episode of Real Housewives of Anywhere to know that. But it also doesn't make you unhappy. Money is just a tool, and a damn good one; it's up to you to use it appropriately. And you know what they say, a good craftsman never blames his tools.