The author displays a severe misunderstanding of dopamine. Dopamine is released when working out, playing sports, and any sort of learning activity (which, honestly, is literally everything). Dopamine is a neurotransmitter heavily involved in learning and adapting to different scenarios/information. It isn't some magical chemical that gets released when doing "fun" things.
Came to say just that. The post is just an advert for "the productivity system at LifeHQ".