People told me I "should" exercise for years and I didn't, but when I did I suddenly got a lot less depressed and my life turned around for the better so I'm going to continue to trust other people

There is a deep irony in an argument that pushes a pro-socializing view in a black-and-white, authoritarian way, "shoulding" statements, shaming tactics. It's actually anti-social, and the authors of the cited paper probably would not agree.

I very much doubt that the authors would disagree with the statement that socializing is a fundamental human need considering they wrote it themselves

nobody's trying to force you to socialize, it's just advice. take it or leave it

You won't be happier if you don't eat healthy, stay indoors al day, avoid talking to anyone, never exercise, never clean up, because those things are considered a chore. There are things people avoid doing that are still needed to be healthy!