I think writer of the article just doesn't know the difference between front-lit and back-lit. A common mistake. The (French) writing on the actual image doesn't say back-lit, it says "light source" or something like that.
Also notice it says (per The Verge's translation): "higher contrast, high resolution." I take this to mean better contrast, but the same resolution as before (otherwise it would have said "higher contrast, higher resolution"). I wonder if the "higher contrast" is with the light on or off, as the Nook with Glow suffers from complaints about worse contrast with the light off. Or probably "higher contrast" means a whiter screen. Hence "paperwhite:" again, do they mean it looks white as paper with the light on or off? People have said that the newest Sony also looks to have a whiter screen. It seems like e-ink screens (all the same Pearl ones) have had a lot of variance in whiteness, maybe they have finally tightened up the manufacturing to get "only the white ones" out there?