I was playing and in the end if you go to the far right, you can skip the fake credits on the final boss, and i saw the world record in any% didnt skip it. Maybe no one knows about but probably not. Can anyone tell me why?

It's because no one knows, otherwise we would definitely skip them. Do you have a video or more specific instructions?

Is it possible you died after the original fake credits? If you don't activate said fake credits, they will play anyways but if you spawn them and die after they won't spawn until the next game over.