The Find N6 still has a noticeable crease, it's just much smaller than the average foldable (here's a video of it with the screen off: https://www.youtube.com/shorts/Ss31thoK7xM).

If someone truly can't tolerate their phone screen being in any way perceptibly different from a single flat pane of glass, then they shouldn't buy foldables. It's something you have to get used to or ignore, with any brand. Especially over time as you bend and unbend the phone repeatedly and the crease deepens.