Why is dragonfire dive described as a fire based attack?

[Tharian]

As is common knowledge, all fire is magical. The wood you see in campfires and fireplaces all around Eorzea is merely decorative.

unfortunately this is a falsehood. Dragonfire Dive is a physical attack. As such it does not qualify for the requirement of being a magic attack for Foe Requiem.

[Mholito]

unfortunately this is a falsehood. Dragonfire Dive is a physical attack. As such it does not qualify for the requirement of being a magic attack for Foe Requiem.

I think he was being sarcastic...