The GP is using a snowclone of the original: "It couldn't have happened to a nicer guy".

For example, if your boss is very rude and disparaging, but then he gets fired, you would say, sarcastically, "It couldn't have happened to a nicer guy", implying there's some element of karma at work.

By analogy, GP is saying these tarrifs were an undeserving act of vengeance. I assume "undeserved" in the sense that it wasn't deserved by those on the receiving end.