All people in the United States other than consular and other rare carve outs are subject to the jurisdiction of the United States government. Otherwise the government would have no ability to enforce its law on them. I think while you may be right due to political aspects of the Supreme Courts loyalties, it’s hard to find a reading where “jurisdiction” means “parents are citizens a-priori.” There’s no discussion of the parents, just that they’re subject to the laws of the United States, and citizenship and jurisdiction of the United States are concepts that have no intersection.