100% read the article.
There are a lot of weasel words in the intro (it is a highly defend topic)
It boils down to this it was not established by Nobel and the winner is not chosen by a Nobel Committee. Calling it a Nobel prize is like calling a winner of Slamdance a Sundance winner.
Some critics argue that the prestige of the Prize in Economics derives in part from its association with the Nobel Prizes, an association that has often been a source of controversy. Among them is the Swedish human rights lawyer Peter Nobel, a great-grandson of Ludvig Nobel. Nobel criticizes the awarding institution of misusing his family's name, and states that no member of the Nobel family has ever had the intention of establishing a prize in economics
the prize is properly the Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel <- a weasel name.