How is that even possible?

I can't do that, but it seems possible if you want to go to the trouble.There's nothing really remarkable about it. Studying a Rubik's Cube, you can reduce the solution to a small number of steps. Each of those steps might take 10 moves or so. But you only have to remember the small number of steps. By the time you have mastered the cube, you already have the 10-move sequences at you disposal and could do those sequences blindfolded without any difficulty.