You have been misinformed. The holding in Wong Kim Ark designates him as a "citizen." It never says "natural born citizen."
I've argued this point for over a decade. It's only two more words, but the court did not add them. They deliberately left out "natural born" in calling Wong Kim Ark a "citizen", and they make it clear that he is only a citizen because of the 14th amendment.
The 14th amendment citizenship is "naturalization at birth."
Oh, come on, your source is not intellectually honest. Wong Kim Ark very explicitly refers to a case (Minor v Hapersett) finding that “natural-born citizen” means “citizen by birth” in the context of the 14th amendment, and uses that definition to base its ruling.