Pretty sure no one here is arguing that Plot Manipulation is superior to other aspects, but that Anos, who has no resistance nor ability that lets him overcome Plot Manipulation, is affected by Plot Manipulation.
Edit: Nvm, some people is. Yeah, that's wrong
Also, from what I remember seeing in other vs threads, erasing a character from an aspect they don't have NEP was enough to defeat them. Reason why Monika erasing Anos from the plot should be enough. Basically:
Monika erases Anos' character file. Anos' concept, information and yada yada still "work" due to his NEP. But since one of his fundamental aspects (Plot) was erased and he does not have anything to supply from that, then he loses
per NEP standards (Anos is reduced to nonexistence type 5 [Plot], where he cannot display any properties of something that exist per lack of feats)