If I were an Elector, I would not learn anything about my constitutional obligations by reading those two pages. In all your research, have you found any primary sources that an Elector might find determinative?
And why would you not? Especially the first page, which is attributed to all the Judges of the Supreme court of Pennsylvania, one of whom was a delegate to the Ratifying convention. (Jasper Yeates)
Again, given that Philadelphia was the center of the Nation and of Law in 1787, why would not the Philadelphia legal community be particularly relevant on the intentions of the term "natural citizen"?
The page clearly states the basis of our law is Vattel's principles of natural law, and not English common law, so you can't fault it for clarity.
All you can do is impugn the knowledge or status of those men whose work was compiled to create it, meaning the Highest Judges in the state of Pennsylvania in 1808, one of which was a constitution ratification delegate.