Oda has drawn Conqueror's Haki clashes enough for us to know that Roger and Whitebeard used it in their clash. It doesn't have to be stated for the readers to reach that conclusion.
I'd even argue that Roger used Conqueror's Haki when he attacked Oden. How else would you explain Oden being...
As others have said. There is no way he wasn't using Haki. Luffy is made of rubber, and without haki the attack would have done no damage.
If I had to wager a guess he either used the same Armament Luffy learned to use this arc, or its an application of Conquerors Haki.
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