Originally it only added special ores that exploded and made pigmen angry because, you know, they were valuable, so it does count as "adding stuff". Eventually it made nether quartz valuable to pigs (and explosive) as well.
I'm surprised that glowstone isn't considered a nether ore too, given how somewhat rare it is without TE3. Nether brick should explode and make them mad too because fortresses aren't the most common thing, the same for soul sand without BoP. In fact, just make pigmen angry if you break anything in the Nether. They're selfish.