Troll metal doesn't exist.  It never has.  Calling something "troll metal" is a description, like "fire metal" or "cheesy metal."  It isn't an actual subgenre of black metal.  First of all, I think this requires a primer in reality.   First of all, reality exists outside your ego and desires of importance by contributing some irrelevant material.  Secondly, reality requires observation, not invention; while you can edit wikipedia pages, you can't edit reality.  Finally, reality probably hates you and wishes ill of you.
When you keep these rules in mind, you're realize that troll metal is an invention and has no places in being in an archive of material floating in the objective world.

I hope this helped you.  Get to deleting that nonsense about troll metal!