There is no deal; there is just a “framework” for making a deal.
In the mind of the Iranians (and all Arabs) that is not a commitment, it’s an invitation to renegotiate the whole business … until they get what they want. That’s how business is done in the Middle East. No surprise or deception in their mind. Moslems are permitted–in certain circumstances required–to lie to non-believers. (It’s called al Taqiya. Look it up.)
“Those who cannot remember the past are condemned to repeat it” George Santayana