That is a screen protector he pulls off at 5:05.
I do LCD refurbishing. I have all of the expensive Chinese machines to do it properly and I still can't get an Edge display done without breaking it. Here is a better video. Its with an S7 but its all the same:
I won't try and talk you out of doing it since you really don't have much to lose but here are some tips:
Notice how they work to get the adhesive off all at once? That is smart. It helps a lot.
Heat is your friend. If you start having to use force, use more heat.
The LCD is glued on like no LCD I've dealt with before. Notice in the video how they have to really force it to get the card under the LCD? I tried being gentle and didn't get far enough under it and ended up separating the LCD.
TAKE YOUR TIME. This is going to suck. You are going to get mad. You will probably question whether you should ever pick up a screwdriver again in your whole life. That's totally normal. Its a crap job.
If you do successfully get the LCD separated, you will need to remove the old glue. Buy some 8022 pol remover off ebay. The stuff is magic. Otherwise you can try the home remedies but you usually end up soaking your backlight through if you use those.