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.

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.