Because they are the inspectors.........
1.)All countries dont allow unsupervised access to military bases.
2.)The IAEA can request access to inspect military bases under the terms of the deal.
"If complementary access is requested to a sensitive location, such as a military base or a high-tech factory with intellectual property to protect, Iran will be able to request that the complementary access be carried out in such a way as to allow the inspectors to gather only the information they need to satisfy their specific request — but not to look around and learn other things that they don’t need to know. All additional protocols include this provision, but it is ultimately up to the IAEA to determine if the access meets its requirements. Depending on the circumstance, Iran might want to move military equipment, transport the inspectors to the exact location they’ve requested in a vehicle with no possibility for the inspectors to see what’s around them, and cover sensitive items with tarps, for example. The inspectors must be able to establish that they are at the specific location they have requested by various means, including GPS navigation."
https://www.armscontrol.org/blog/Ar...cation-of-the-Iran-Nuclear-Deal-10-Hot-Issues
False. If there are disputes a special adjudication commission will ensure disputes are settled within 24 days.
https://www.armscontrol.org/files/ACA_Iran Brief_July28_D.pdf