This is another example of that willful lying you are so famous for. When he makes THAT EXPLICIT VATTEL QUOTE, HE IS TALKING ABOUT CITIZENSHIP.
Now of course *YOU* allege the case is not about citizenship, but let's see what Justice Bushrod Washington has to say what the case is regarding.
Justice Bushrod Washington:
"The claims of Maitland, McGregor and Jones are resisted in toto upon an objection to the national character of the claimants."
...
There being no dispute as to the facts upon which the domicile of these claimants is asserted, the questions of law alone remain to be considered. They are two -- first, by what means and to what extent a national character may be impressed upon a person different from that which permanent allegiance gives him, and secondly, what are the legal consequences to which this acquired character may expose him in the event of a war taking place between the country of his residence and that of his birth or in which he had been naturalized?
Yeah, you're wrong about that too. The entire case was about citizenship.