I would strongly disagree with the last part of that statement.
Restickering can be tricky too. Plus you need new stickers. Replacing peeled stickers on a cube looks awful and is bad practise.
There are plenty of guides on youtube on reassembly of a rubiks 4x4, but in this case they are not needed.
Here's how you fix it:
1) Put the offending corner on the top.
2) Rotate the top face 45 degrees either way.
3) Using your fingers if possible (or with the help of a flat, non-sharp knife), pop out the 2 pieces to the left of the corner. You could pick the 2 on the right instead if you want, just pick one of them. As long as it's not one on each side! hehe
4) You should then easily be able to rotate that wrong corner so that it is the correct way round. If you can't do that, then it has indeed been sticker peeled. Go to part 7.
5) Replace the 2 edge pieces - might take a little pressure to do. Don't worry, you won't break the cube - how do you think they get assembled in the first place?
6) Rotate the top back into place. Your cube should be fixed.
7) If at stage 4 you could get the corner fixed on one face, but the other 2 were swapped, it means someone sticker peeled it at some point. I'd resticker the whole cube with fresh stickers or preferably tiles from cubesmith (google it). I recommend the textured tiles.
8) Don't de-sticker it again.
Please take off topic discussion off this forum. Thanks.