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It's way more likely that he just doesn't know. In any case, remove the stuff he's been adding and if it continues to be a problem talk it over in P Ms.
He definitely needs a PM conversation.
"It's Occam's Shuriken! If the answer is elusive, never rule out ninjas!"
Let me take a look at those edits... You know, sometimes I see stuff like this and think "This guy has got to be kidding." Come on, what's up with an edit like "YMMV on whether she wears tight t-shirts"? Either they're tight or they're not, it's not a matter of opinion at all!
He's also the same guy who keeps trying to declare Facebook Deader Than Disco because...apparently one or two sites in the UK popped up that do the same thing?
Valxam56 doesn't seem to know (or care) if the trope(s) he is adding is subjective. Either he just doesn't read the trope page, or he keeps ignoring the "Please don't list this on a work's page as a trope" message. Nightmare Fuel and High Octane Nightmare Fuel seem to be his favorite tropes, as he's put them on a bunch of different pages. Those aren't the only ones though (he put Ass Pull on the Criminal Minds page). Even when the trope he's adding doesn't have the YMMV warning, you sometimes get the feeling he only paid attention to the trope name.