WRONG.
In fact, it DOES state "permanently domiciled" as an agreed upon fact on which the decision is rendered:
"The evident intention, and the necessary effect, of the submission of this case to the decision of the court upon the facts agreed by the parties were to present for determination the single question stated at the beginning of this opinion, namely, whether a child born in the United States, of parent of Chinese descent, who, at the time of his birth, are subjects of the Emperor of China, but have a permanent domicil and residence in the United States, and are there carrying on business, and are not employed in any diplomatic or official capacity under the Emperor of China, becomes at the time of his birth a citizen of the United States. For the reasons above stated, this court is of opinion that the question must be answered in the affirmative."
There it is, in plain English. Non-citizen parent permanent domicile is an agreed upon fact on which the decision is rendered.
Right, it's an agreed-upon fact. That doesn't make it a requirement. Look at the other agreed-upon facts in the same sentence: born in the US, parents of Chinese descent, subjects of the Emperor of China, and are in the US carrying on business. Are those all requirements, too? Like I said before, does the WKA decision only apply to people of Chinese descent?