It sounds like a huge amount of money and a clear sign of defeat. The US (or maybe Europe, who knows?) is paying Iran some form of tribute.

But, there's another way to see this: if you pay someone money, you end up with a lot of say in what they can or can't do. That money does not come with any guarantee; the party offering the money will keep the money flowing based on their own perception of good behavior of the party receiving the money. The post-Trump administrations will find themselves in the possession of a tremendous amount of leverage with Iran.