Saying it's invalid doesn't make it invalid..
When the power is introduced in the narrative it's what matters not before nor after..
When the main character reveal a new Haki CoC level, Oda point it out with Law saying the same thing Oden said in the first hint at AdCoC clash with Roger and Whitebeard, the 2 most legendary pirates ever in the One Piece World..
The Barrier itself is a defensive ability, it can't do internal damage like CoA level 3 Internal Destruction and CoC Coating..
When Luffy used AdCoC for the first time he was Damaging Kaido internally and that was not CoA level 3 either because
it needs to make contact for it to be powerful..
Not Touching + Internal Damage = AdCoC
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Oda contradict himself a lot..