A lot of chronically unhappy people are adept at masking - faking they are happy and/or neurotypical. Especially so when they are aware that they are being tested for it.
It's quite possible that a percentage of the top performers referenced on the original article are just doing that.
People tend to have an overly optimistic image of what it means to be neurotypical.
Neurotypical people are not the extremely successful, always-happy, super charismatic elite. That's the 99% percentile. They are as outliers as the most unhappy and miserable of the people.
Neurotypical is about the norm. If you have your set of problems but you don't need to take psychiatric drugs to deal with them, then you are neurotypical. And that's it.
I think that's an important point. I can believe that happiness is a component of workplace success, but the sort of stuff discussed in the article (self reporting happiness after writing Three Good Things narratives) sounds like it's far stronger evidence of compliance than actual genuine increase in hedonic well being.
It's quite possible that a percentage of the top performers referenced on the original article are just doing that.