I haven't really heard it being used like that, always heard e-paper being used as the specific e-ink displays and never anything else. The only time I've seen the (in my mind) confused messaging is on Pebble's own website, I still have my original Pebble Time somewhere, and that's a good part just down to how much I love those displays. I don't think I'd have used one for years if they were epaper.