Did Rome Actually Recreate the Destruction of Yashar'al as Entertainment During the Triumph?
Primary: Josephus, The Jewish War 7.5.5 ยท Event: Flavian triumph, Rome
What the ancient record says
Beyond displaying spoils, Josephus describes enormous moving pageants recreating scenes from the war: a prosperous land being devastated, people killed, people fleeing, captives taken, walls battered, fortifications captured, fire sent upon sacred structures and buildings. The suffering of the conquered was turned into a visual spectacle for Romans who never witnessed the war; the craftsmanship made scenes appear almost as though spectators were witnessing the events.
Not a documentary, part of a triumph celebrating Roman victory, incorporating the destruction of the defeated. Sequence connected war, destruction, captivity, spoils, and Roman victory, with the sanctuary objects appearing prominently after the war scenes.
Read it for yourself. Josephus, The Jewish War 7.5.5.
Evidence strength: Very strong primary ancient testimony.