1.) It establishes the fact that fiction articles are only notable if there is out-of-universe infomration available
Information is neither "in-universe" or "out-of-universe", it's just a collection of facts. It's the presentation of that information which is in- or out-of-universe, any in-universe content can be re-written out-of-universe (although a large amount of in-universe content is often a clue that the article needs trimming, so I'm not suggesting blindly rewriting articles). I think what you're trying to say is that there should be non-primary reliable sources in order for something to be notable, which is probably a good rule of thumb.