This is a false narrative. While true that the sanctions have pushed the value of IRR down, the lifting of sanctions, during Obama / Khatami era only fed the corrupt IRGC and its shadow economy. It is easy to think that people are being forced to sell kidneys because of the economic sanctions and as countries imposing the sanctions we are implicit in this, but the Iranian government and Khamenei are the main culprits here. They have the power and the means stop playing menace in the region, stop their proxy wars and move towards lifting of sanctions. There is a small but vocal Iranian backed lobby in the US (NIAC specifically) that is constantly pushing for the lifting of sanctions, even during the most brutal suppressions of the Iranian people by the government, peddling a narrative that the Iranians are dissatisfied with the economy and if the sanctions are lifted, all is going to be ok.
There is a shadow army, government and economy in Iran, created and tightly controlled by the office of the supreme leader, Khamenei and enforced by IRGC. They have a chokehold on the economy, imports and exports as well as almost exclusive control over critical foreign affairs. While lifting of sanctions will marginally reduce the pressure on the IRR in the short term, it will feed this cancerous growth which is not in the interest of the Iranian people and the world.