Hmm.. WAF first gives a list of examples of what constitutes actual oou-perspective, but in the second section says "or describing things from the author or creator's perspective". Including only statements referring to specific parts of a work is more like half-in-half-out-universe, your example still lacks any information regarding an essential out-of-world- perspective, and a simple reformulation seems a bit WEASELy. But that's really just my opinion, obviously I'm in mild disagreement with the current wording and interpretation of WAF. It's what I'm arguing for after all: WAF should give less leeway in that direction, since it's currently giving too much of it.
I don't understand what you're trying to say in your first sentence, so I'll ignore it for now. My example is 100% in an OOU perspective, by the definition given in WP:WAF. Yes, it doesn't include any non-fictional information, but that doesn't make it IU. Could you tell me what part of WAF says you have to include non-fiction details in order to make something OOU? I've just re-read the page, and I only see one mention of "out-of-universe information" (which I think is a confusing name, since OOU information and OOU perspective are quite different things - non-fiction information is clearer), and that's just to explain why it is important to include plot summaries, it's not related to anything about how to include plot summaries. The section is headed "Presentation of fictional material" - it is quite clearly talking about fictional material, not non-fiction.