It floats the idea that there natural born citizen is a separate status based on two citizen parents. It acknowledges that some make the legal argument. Then it specifically states that it's moot, because there is no doubt the person in question had two citizens for parents, so they don't have to make a decision on that matter. It's an interesting legal footnote, not any kind of precedent.
All that matters is... What was the definition of “natural born” when the phrase was used in the Constitution. Case law is meaningless here. We are NOT interpreting here, we are simply defining words. Natural born is born in the country to two parents whom are citizens. Anything else requires statute to clarify, and is therefore NOT natural born.