How would a final court ruling shield someone from executive power? The court relies on the executive to enforce its decisions. They can find a person in contempt, and order fines or jail time until that person complies, but I believe the orders are then enforced by U.S. Marshals, who are executive appointees.
If the Marshalls neglect their oath to the Constitution (whether ordered to by superiors or not) then the court can deputize others to carry out court orders. IIUC correctly that's usually the police.
I think there's no hard power stopping them but in general they've been reluctant to openly defy courts (they have defied lower courts some while claiming they haven't). I think at least adhering to some pretense of American democracy has so far been important to this administration and if they abandon that pretense carelessly they run a real risk of losing necessary support (popular support, Congressional support, but also support of executive branch institutions).
Also, it's not that I think they won't defy courts but they'll be very careful in doing it (well, at least as careful as this administration can be) so it's still a reasonable base assumption that court orders protect you since while it's not the ironclad protection it was it still gives you some protection for now. Though that "for now" is obviously rather ominous.
This is a serious question. What have I missed?