wqhat about this article from 2011? this whole thing seems fishy to me
https://www.theguardian.com/world/2011/nov/08/iran-reasearch-nuclear-warhead-watchdog
it says in it: The UN's nuclear watchdog on Tuesday expressed "serious concerns" that Iranhad been carrying out research work on the construction of a nuclear warhead, and said the effort could still be underway.
In its report on Iran's nuclear programme, the International Atomic Energy Agency (IAEA) said it had accumulated more than 1,000 pages of documentation that had let it to believe that suspected nuclear weapons work was done under a "structured programme" up to 2003, and that "some may still be ongoing".