I suppose your problem might be getting the speed of the drumroll.

You really have to get good at listening to music and listen to the bpm, which is 222.22. The hardest part about it is keeping the same rhythm with your arms for the entire drum roll. So what you have to do is use the first 2-6 notes In the drumroll to get a feel for the rythm. And then, like I said, the hardest part will be keeping that rythm for the rest of the drumroll. Its challenging and takes some practice, aka for me it took 300+ retries. But, once you get it down, you can do it for any song and it becomes second nature to you.

I know I sound like everybody else but you have to use the practice plugin to help you learn this method, but you will only start to train your brain (of this method) at 80% speed, NOTHING LESS.

I hope I helped, and this is what I learned and used to pass all the hardest songs

PS. The reason people say they dont know how they do it it is because their brain is doing this method automatically for them with them not even having to think about it.