Facts:
Nightcore songs aren't really referred to as remixes except by a few misinformed people. It's just songs sped up in a pleasing way, occasionally with some other minor adjustments. Exactly like vaporwave, just slowed down instead. Some songs just sound good or even better when the speed is changed (though that's subjective).

hey guys i can open an mp3 file in audacity and turn up the pitch haha see how talented i am