This is a well known crease technique. With Blender, select a string of edges that you want to turn it into a crease, and do a Alt+V, position it, and then do a Loop Cut (Ctrl+R) in the center. Push it inward and you have a nice crease effect.
Recently I tried to reverse this via Python scripting in Blender. I knew what needed to be done but failed in my first attempt because the indices of edges get randomized after you deleted or removed any of them. It was chasing after the wind, so I thought of another way to go about it and today it finally dawned on me. This is my way of brute-forcing it, and it works, even on multiple creases at once.
This script only works effectively on a crease pattern. This can be turned into an addon and bind it to a hotkey easily. Let’s see if this can be appended to the delete menu.