Has a FIBA World Cup game ever ended 84-52?
Exactly once. On February 20, 2021, Portugal beat Cyprus 84-52, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 84-52 in league history.
That makes 84-52 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 85-52 has happened never and 84-53 has happened never.