That's a good link, the author has a bachelor's in philosophy, so that gives it some credibility, and he is providing a nuanced summary of some philosophers' views on individual wealth. Schopenhauer is the only one to come close to what you're saying, and he's famously the most depressed/depressing guy to ever have walked the earth, not that that means he should be discredited of course. As a list this in no way backs up your point about wealth on a societal level. Just because you identify with an idea that does not make it true.

Here's an actual research paper with statistics touching on this subject. The authors argue that local wealth coupled with large inequality may cause many people to borrow above their means, causing unhappiness.