I didn't see the name of the rom at first. I suppose you're assuming that if someone knows what an emulator is they obviously can then go and find the rom that corresponds with the video.
Perfection isn't possible. I'm well aware of this, but it is theoretical. Now, if someone over at www.planetquake.com/sda/other beat one of your times, then I'd think you could probably do better with slow-motion and save states. However, if no one has ever beaten a game before and recorded doing it, I think they can do it as sloppy as they want to. It's kind of human nature to want to do it faster and better anyway, so I doubt the "sloppiness" would be that bad.
I did speedruns of Max Payne on fugitive. Most of the speedruns are ok...not great, but it was because I was simply trying to beat the level. I was still in the state of mind where I figured beating a Max Payne level without dying was impossible. I mean there's a reason why you can save anywhere in the game. Once I beat the game, every level, without dying...I didn't do it all at once but level by level, I then went back and did all of the levels on New York Minute mode. I smashed most of the times I had gotten previously, sometimes more than a minute and a few times more than 2 minutes. I went back because I knew that I could do better.
Cya