After chapter 1010 we learned that coating attacks with conqueror is what a handful of strongest can do. So Luffy at chapter 1000 wasn't using the ability that those shadows probably used against Kaido. That makes that statement completely bullshit back then and would make sense only after 1010.
This is just another proof of how much Oda is lost in his own work.
This is just another proof of how much Oda is lost in his own work.