What a weird interpretation of that.

That law has nothing to do with incriminating yourself (it's more about safety), but even if the law was specifically "so someone can see into your window and identify you if you do something bad", that's still not self-incrimination. Self-incrimination is requiring someone to testify against themselves.

Your position boils down to: "I should be able to commit traffic violations anonymously because anything else is an infringement on my 5th amendment rights".

Basically you're saying that any law is invalid if it makes or ensures that any kind of wrongdoing visible to witnesses. That's absurd.