The particulars may vary, but it almost seems obvious to me how they are going to walk this back. It doesn’t take a genius to guess that they’ll handle it how they handle everything these days - through creative accounting.
They’ll amend the law so that 9/11 families that win a judgement against S.A. will be paid out of some US-government controlled slush-fund or other, and then it will be the purview of Congress and the State Dept. to decide if/when/how *they *decide to enforce the judgment by collecting from S.A.
It will basically boil down to our diplomats using a somewhat make-believe/self-proclaimed ledger of “debts” as a stick to carry in their back pockets for when the carrots aren’t working.