Boo hoo hoo. What you think should be is not what the law is.
Lol, and just what is the law in this case? You don't know because we don't know several key facts about it.
People are or are not citizens based on the circumstances of their birth. And if the circumstances of their birth entitle them to US citizenship, then they are US citizens in reality. But they are not recognized as citizens until the facts are established as required by law. I believe this guy is a citizen, but I could be wrong.
de facto and de jure. The law has not yet said one way or the other whether this guy is a citizen. No legal authority has all the facts to consider and render a verdict in this case.
And you sure don't know all the facts, or what parts of the law would or would not apply.