Not really. Land ownership doesn't change a thing. What may change things is determined by bilateral or other international agreements on an state-level, but that's not relevant to any of the US CBP Preclearance airports with common carrier flights.

US CBP Preclearance facilities outside of the US are not US territory. Ordinary travelers in those CBP Preclearance facilities -- in say Canada, elsewhere in the Americas outside the US, in Ireland and in the UAE -- are subject to the jurisdictional authority of the host country and are in fact in those other countries even after being cleared by CBP to enter and remain in the CBP Preclearance section of the foreign country's port(s).

Let's take the case of a wanted criminal in Canada or in Ireland who is immune from prosecution in the US and has US-recognized diplomatic immunity but happens to not be immune from prosecution in Canada and Ireland. Such person getting into the CBP Preclearance area at a Canadian or Irish airport provides the person no protection from being arrested by the law enforcement authorities of the country hosting the CBP Preclearance facility where that Irish/Canadian-wanted criminal got airside into the CBP Preclearance facility as a person US CBP considered admissible.