Sueing a monopolist for making something cheap 
Price inflation is when things get more expensive, not less expensive. Unnatural monopolies (which arise as a result of government, in contrast to natural monopolies) result in higher prices and poor service, never lower prices.wolongong says the lawsuit is complaining a monopolist, the US, made its product, the dollar cheaper. wolongong is correct and it's a funny reason to sue a monopolist.
Remember "cheap" can mean either "inexpensive" or "poor quality." Although making a dollar inexpensive in the local scrip would also damage any investments held in it. But if you're going to do that, you might as well sue the Chinese government for having a currency that doesn't lose value as fast as the dollar.
So the only sense in which it actually makes sense to sue is for a poor quality product.