I think that we can scale Superman from the explicit feat of destroying the 52 universes-sized multiverse, even though powering up to that degree from absorbing sunlight makes no sense, but punching out the World Forger within the 6th Dimension is just another case of "everybody can fight and beat everybody" that Marvel and DC Comics run on on a narrative level. By the same logic the Black Panther should be Low 1-A for defeating an entity that killed the Living Tribunal.
Mind you, I love many of the classic characters, but I also really can't understand why anybody, especially powerscaling communities, would enjoy the current comic book stories, as they are very blatantly mostly incoherent, slanted, and propagandistic manipulative nonsense. Essentially, they don't make any sense, constantly contradict each other, don't respect continuity at all, and relentlessly try to brainwash their audience, rather than set free their minds from dogmatic patterns. As such, I have finally almost completely stopped reading them after many years.