I disagree with this implication. Some depictions of this "spear" depict it more or less as an immaterial mass of energy, such as post #263841, post #437190, and post #447815. They're barely what I would call a "spear."
Even if the weapon is made of energy, it should still have a clear enough form of the weapon to receive the corresponding weapon tag (or any other tag corresponding to a specific physical item/shape)