I dunno. My understanding about that section of the US Code is that it is specifically talking about the word militia in the 2nd Amendment.
Where did you get that understanding from? It's possible that the framer of the language wanted to influence court interpretations of the 2nd, but I've never heard that case made except by the pro-gun lobby. After all, the idea of an "unorganized militia" seems to make no historical sense. At best, it seems to refer to the pool of people eligible for militia duty. The language of the 2nd, of course, makes no distinction at all between "organized" and "unorganized", so a court might well rule that the amendment was never intended to apply to anything but an organized milita. Historically, the debate was over the ability of states to train organized militias with weapons supplied by members of the militia itself.
As to that court case I referenced, I wasn't aware that it had been discredited.
See your Wikipedia article on the first ruling mentioned: "This decision conflicts with the later holding of the Ninth Circuit Court of Appeals in Silveira v. Lockyer". Note that both sides of the gun debate are active in trying to get Wikipedia to reflect their take on the subject, so be wary of what you read in there. It is more important to note that the vast majority of court cases have never upheld a 2nd amendment private right of citizens to bear arms. These are the only ones out of scores of such cases, and they are of relatively recent vintage--only a few years old.