1. Oil in the FA takes a long time to drain out of the heads, especially when cold. If the drain-plug swap was done quickly, it might help explain.
2. The dipstick enters the engine at a pretty shallow angle so the extra height of the oil is less than it appears.
If the engine was filled with the specified quantity of oil without considering point-1, that would explain the overfill. Point-2 makes it embarrassing for the honda guys but that's all.
They should be used to that feeling anyhow.
