The problem here, is that this "ability", is basic Haki...
Rayleigh, Laffite, The Minks were able to use it...probably Shiryu...
That's not how Advanced Haki works...That's basic stuff, to hide your presence shouldn't be a power up...
I feel like he did this video because he felt necessary to compensate the Zoro CoC video...But I think that's not a Haki PU , because is one of the basic things of Haki IMO...
Not even all the samurais were able to use Advanced Haki, but you're saying that an entire tribu, is able to use Advanced Haki??
It's just another basic use of CoO...For me of course...