You mean the extremely precise input into the Level 1? Yeah if anyone can actually 'do' that they deserve the kill.
This, it actually takes skill to do it. I'm certain Seth Killian knows of the empty cancel and encourages it because it takes skill to perform.
First things first, I said "infinite", see the quotes?
I wouldn't say it's an extremely precise input, you just use the super after the third hit.
I would also like to say that every Dante I have faced so far can do this annoying combo and it really irritates me. People wonder about rage-quitting, this is one of my reason of doing so.