Of course Kaido's club isn't a graded blade, because it isn't a blade at all, it's a blunt force weapon. They are called the Supreme Grade Blades not the Supreme Grade Maces or Clubs.
You're right, they're trying to gaslight you, Shusui was probably a skillful grade sword, but it leveled up to great grade when Ryuma turned it black, Enma has potential to level up to supreme grade if Zoro turns it black.
Rootbeer kinda cooked here, if turning your blade black doesn't increase the grade of the sword then the black blade process turns from pretty much useless to completely useless.
Turning a blade black even though it's already supreme grade wouldn't increase the grade again tho, obviously...
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