(zen) buddhism is a lot of things but certainly not a fairy tale. The basic assumption is that suffering is the basic state of life, that life is very unfair and arbitrary and that what you're going for is not even happiness but elimination of desire and ultimately the self. Very non happy go lucky as far as philosophical systems go. The article really has a very botched definition of happiness going on which it defines right in the beginning:
>For us, happiness is the target state that we want to achieve, at which we would be in our ideal condition
Happiness isn't a target state or object to be grasped, which is very trivial to show. Just imagine you get everything on this shopping list of happiness. Now you wake up the next day, what do you do? Life is always in some state of non-equilibrium and in particular if you do, as the article suggests, define happiness as a sort of string that pulls you along.