Hmm, Idk then.
I know if there's 1 instance of a LI having sex with someone else, the game gets slapped with an NTR tag. If there's a futa in the game, even if there's no sex, the game gets the Futa tag. I guess it's like that. All it takes is one instance of it for it to count.
I guess that's more because NTR and Futa haters really can't stand even a bit of it, so it's more a tag that helps you avoid what you dislike than anything.
But even people that are not interested in Real Porn will unlikely want to avoid a few backgrounds picture or short videos on a screen in-game. That's what I said before that those are in the category of "Technical tags", they're more to show how the game works and not a one time thing. There are many games having some Real Porn on TV, PC, magazines... not having the tag.
And not being mandatory for the rules "Even 1 single picture is enough to put the tag", I think including that just doesn't help the developer to promote the game. "Real porn" seekers will avoid it as soon as they see the promo pictures, "Real porn" avoiders will probably miss it accidentally if they use the "exclude Real porn" filter, even if they wouldn't mind having a few pics of real porn thrown there.
Edit: Ok, I see it has been already taken out of the tags.