The IAEA agency reports information on nuclear projects to western countries. That being their job doesn’t change what they do, it just legitimizes it.

After having their nuclear sites targeted thanks to this information being known, Iran probably has little interest in making the same mistake again.

Also their nuclear sites are utterly destroyed and they won’t be able to do anything nuclear related for years, so what would they investigate anyway.

Irans nuclear capabilities were totally destroyed, why would they need to continue to cooperate with a nuclear investigation agency, which totally doesn’t leak information to the west.