On e you get uranium enriched to 20%, it becomes logarithmacly easier to enrich to higher grades. This is what the centrifuges do. It only takes 6-8kg of highly enriched uranium, or four times that amount of enriched uranium to make a simple Gun type nuclear weapon capable of at least a 20Kt detonation, which will wipe out a good 2 kilometer radius. I believe there is something wrong with this article, the person who wrote it, and the science they used as reference, and I believe it is deliberate. We have known all the physics of what is needed produce nuclear weapons since 1938, and have improved on them to state of the art around the mid-1970s. Iran will have enough HEU to make a make a bomb, and they probably already do.
And HEU is not even necessary to make a dangerous weapon. A large amount of LEU can make a great boom in the low 100t to Kt range too. All the physics and case studies are available on YouTube, Archive.org, your public library and many other places. This article is propaganda catering to stupid people.
Iran’s second gen ventrifuges are apparently offline, while their stone-age centrifuges are apparently still online.
Like I said Iran seems to be far from the bomb, but not real far.
If you have any info that discredits what the IAEA has to say, then post it.