know everything about us and would track us down if any hidden or un-deleted photo was ever published.
"if you go back to your country and post anything we will murder you"
Personally I'd just use encrypted backups or data recovery and post literally everything I could, possibly with a taunt calling out the coward who can only threaten people when backed up by billions in military funding and personnel.
"... without any assumptions, regardless of how plausible, bordering on certainty, that the assumption is" I suppose.