I don't understand how KFC (an American company) has managed to do business with Iran when this sort of cooperation is in breach of the sanctions.
Furthermore, I don't get the big deal as Tehran already has many fast food chains like this that imitate western companies. The fact that it would be called "KFC - Iran" may suggest that it is not the same company located in the West. The owner has probably used the name and rebranded it without the company's (KFC) consent.
Either way I don't consider this a valid source.