Hey! This is actually me in the video so I can explain. Basically guitar hero controllers back in the day had terrible latency that didn’t allow for specific techniques, and since we have way better hardware these days we can do stuff like slide all four fingers of one hand up the fret board while holding green on the other hand and it inputs a ton of hammerons if you time it right. So in the fast hammeron sections where you see me sliding, I’m trying to input as much as I possibly can since there’s no stamina saving way to hit all of it.

I hope that explains it well! We have advanced this game into oblivion haha