So i looked at the world record, and he somehow completes Minescreeper in one click, i want to find out how, There is no way this is just 100% Pure luck, I want to find out how it's done.

I have the same question, as an older runner what I did was made minecraft a small window size to where there were about 4 boxes and clicked. Now I don't know about the one click thing though,

You can win Minescreeper in 1 click by placing a sign (right click) as your first input when it first appears. Once it's placed, click any square, and it will take you to the credits.