What about "screenshots are forever" do you not seem to grasp?
My mistake, that's not a copyright claim. Just an appeal to a website owner to take down content that infringes on your intellectual property - a claim of your copyrighted interests, so to speak.
Even if you deny filing in defense of your own copyright, you directly accused them of copyright infringement for other IPs. Why bring that matter up? It's not your IP so you have no personal stake, so maybe you just have the honorable intent of protecting other artists' work. ...but then you turn around and "totally support" the game, alleged IP infringement still intact. Almost as if it didn't really matter to begin with.