While I find the article on diluting interesting. It is still a false equivalence and the argument does not hold. While I do not disagree that dilution is much easier, you have to remember as well that that project was spread across continents, involved inter-governmental agreements, IAEA oversight, shipping logistics, and safe handling over time, not urgency. Iran, by contrast, is likely operating in a tightly controlled, centralized, and high priority military-industrial context, potentially with far fewer procedural slowdowns.
Even if your theory holds true, then the only way U.S. intelligence could claim that Iran's nuclear program was set back by just a few months is either because the assessment is entirely fabricated, or because they have yet to uncover other clandestine facilities where enrichment may still be ongoing. The latter seems more aligned with US intelligence assessments based on Iran having the knowledge, expertise and even , infrastructure at black sites locations.
