parents are overall less happy than adults without kids

Higher levels of stress, less money in the bank, fewer hours of sleep, yadda yadda. You could say the same thing about people who start their own businesses or take up a career in politics or do literally anything that's taxing on the human body and mind.

Want to know how to live a truly carefree lifestyle? Take up heroin. Folks in an opiate haze are consistently ranked some of the happiest on earth.

And the post was about vibe and chill

It's this sort of weird backhanded brag that tries to make a virtue out of self-indulgence. Might as well go full Gordon Geeko with it if you're this far in.