All the Iranians have to do say is say the magic words , “Unless we mutually agres to allow you to, you have no inspection rights and we do not agree to allow you access or inspection rights” , and the IAEA is dead in the water and barred from the facility or inspection
Don’t worry, we can always ask the Iranians to inspect themselves. I’m sure they’d be more than willing to - as long as we reimburse them the cost of self-inspection. I’ll bet I can even guess their findings: “nothing to worry about.”