It's saying the government has so many protocols, laws, restrictions and the like that yes, it would be highly illegal for an American company to sell products or information pertaining to building nukes to Iran. I really don't know how you claim otherwise, unless I misunderstood you. And although there are companies from other nations that could sell components/expertise, most nations who have such companies have similar laws and are unwilling to cross America in this area, making de jour law even if it's not de facto everywhere.