I enjoy this person's commentary and agree with the later point about fooling yourself, but this is a convenient jumping-off point to observe a problem with setting your own happiness as the highest good: it ignores the world you're in, often to the detriment of your stated goal
James Carse wrote the incredible "Finite and Inifinite Games" about life, games, and the sort of trustworthy playfulness we've all seen in the world but have a hard time describing. It's great, but it's got a huge hole in it.