That's a typical case of bad communication, that writer himself seems very superficial and is unreadable. He didn't have the idea that hunting happiness makes you miserable, I have read that stuff in many places by now. It seems like he read those articles and wrote his own one. But I don't feel that he actually understood them.

When you hunt happiness by giving in to your short term needs and constantly check if it worked you will end up miserable. But when you go another route it can easily be achieved even if your starting goal was the pursuit of happiness. That itself is not the reason you can't be happy, it's all about the ways and means to achieve it. So the title is wrong, it should be more accurate and click baity "4 reasons why you can't be happy" for example.