You can't divorce the law that's on the books from the organs that enforce it. Any legal theorist will tell you that. Any lawyer will tell you that, and if you were ever involved in serious litigation you know.
But that they can be sued in a court of law is actually a very big deal; it is the defining thing that makes them not the law.
A reminder of what I was responding to: “They issue the claim, the judgement and the penalty. And there is nothing you can do about it. Why? Because they are the law.”
That is plainly untrue. There is something you can do about it. You can sue them, precisely because they are not the law.