tbf, it's unclear to me at this point how much of that is going to represent $$ out of the American pocket. A lot of it is "guarantees of financing and investment" by other gulf states. Probably we're subsidizing Iran re-investment, and the costs of that are intentionally ambiguous.
If its USD dollars that are going to be spent, its not different than Fed literally printing money out of thin air and sending to Iran. The mere consumption of these dollars will have some effect on global inflation and will strenghten Iran long term