No, its not. This isn't infusing their attacks with COC like Kaido is doing. This is a clash of conquerors, sure. But its not them "infusing conquerors haki" into their attacks like Luffy says Kaido does. Luffy didn't know how to do that until he freaking fought Kaido.
nO iTs nOt
Are you blind? Stop using the word infuse. That's just what VIZ wrote, but it's too vague. More specifically it's "coating".
Luffy vs. Kata did the same thing as Chinjao.
Armament, Conqueror, Observation they're all a manifestation of 1 Haki. CoC users can put both CoA + CoC behind their attacks, but only some can COAT themselves in it.