It is said that the classic ironman armors cannot be removed by nullification
So why does the buffet node cancel them and give the rival regeneration?
Champions like Galan, Vivision, Omega Sentinel and others immune to nullify the node does not affect them despite activating the advantages just like the ironman.


Beginning of the fight, Ironman begins with his armor, and Bishop activates the node despite not overriding him.

combo 20, ironman gains his armor, and again without nullifying it, the bishop gains his unblockable and regeneration perks

Maybe it was done that way on purpose, because if that's how it should work, it's not as useful as many of us believed.
PD: Obviously I lost the fight, I didn't lose any of his health, because everything was healed with the regeneration. And if he didn't die from playing badly, he would still lose it due to time.