[klmlryc11]

Meta studies study individual papers which in turn are essentially asking people if they feel happier if they do X. Anecdotally.

This particular one does a lot of math which no one has the patience to verify. It just sounds smart, like the papers on nature.com that advertise probiotics.

If you trick yourself into being happy while being exploited by the system it may indeed work (that's why rulers liked Christianity as a tool for pacifying the masses). But you are not solving the underlying issues.