The Orff is in a poor position to hit the Hades.
When the Orff jumps in, it targets a specific laser turret on one of the Hades's "wings." After this turret is destroyed, the Orff adjusts its aim to hit the turrets on the Hades's rear engines. However, the Orff doesn't move after it jumps in, so it isn't actually in range to hit either of these turrets, and just shoots fruitlessly in their general direction, pew-pew-pew.
The Orff does eventually move once the Hades enters its final phase, but by this time, the Hades is seconds from being destroyed, so it doesn't much matter.