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Wong Kim Ark’s parents returned to live in China, they never came back to the US.

Again, look to the U.S. v. Wong Kim Ark ruling:

"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.

That Wong Kim Ark's parents were permanently domiciled in the U.S. at the time of his birth is an agreed upon fact in the case.

Furthermore, the Supreme Court was aware that his parents returned to China when he was 17, as we can see in the Court's Syllabus:

"That said mother and father of said Wong Kim Ark continued to reside and remain in the United States until the year 1890, when they departed for China."

U.S. v. Wong Kim Ark - Syllabus

That did not preclude the parties or the Supreme Court from agreeing that Wong Kim Ark's non-citizen parents were permanently domiciled in the U.S. at the time of his birth in 1873.

We know for a fact that Obama's father was never permanetly domiciled in the U.S., even at the time of his birth, because he was always in the U.S. on a temporary student visa.