He knows Kid has all 3 types of Haki. He's talking about the lack of its usage.
Which would be fine, but he didnt said that. So i needed to correct that. :D
Additionally, i think it is even more impressive, since he has the whole package of Haki to improve alot, while he is DF-wise at the same stage as Luffy, early usage. While Luffy is already deeply into Haki, for Kid it is more less completely open. Just shows how impressive Kid is already, even "without" haki.