Imagine a dev putting months of work into a DLC for it just to beaten in under 5 minutes, its pretty amazing on how much attempts and time it takes to find these methods, props to you
Not that I know of. You just need to collide with the slope at high speeds. It's not 100% consistent because the Soldier's position is random, but if you follow what I do exactly, you should hit it at some point. Though it may require high framerate.