I knew the politicos that negotiated the Iran deal had been duped by Iran's nuclear mastermind when it was revealed that the Iran deal allowed Iran to develop their IR-6 and IR-8 centrifuges. The deal limits them to one IR-8 centrifuge, but once they are able to perfect the technology, it's nothing to mass produce them. The Iran deal gave them the needed cash to fund the IR-8 program, which is up to 24 times more efficient than their current IR-1 centrifuges for enriching uranium above 90%.
Iran is either foolishly wasting money developing something that won't add any value to a peaceful nuclear program, or they're spending their money for the necessary investment to efficiently produce high grade fissile material for nuclear weapons. I'm pretty sure we know the answer to that.