Well, steel's not really portrayed as a liquid in this series, so I fail to see the complaint there. As for water not being the only liquid, while that's true, other liquids are not dubbed with water type. Reuniclus is liquidous but is psychic type. Water types are generally named for their residence, or for actively incorporating actual dihydrogen monoxide. So. Argument there's false too.
"The point of war is not to die for your country. It's to make the enemy die for his."