I actually wasn't impressed with that demo. He just barely touched the blade as slowly and carefully as possible. How often is that the way in which a finger is lost? It's usually either kickback, pulling the hand into the saw (happened to my boss), or feeding into the saw at high speed and forgetting to move your hand. If you're pushing that slowly, when your hand contacts the blade, you're going to jerk it back immediately anyways, without much damage.
I personally spend a good couple hours behind the saw on many days (cabinetmaker) and I'm often feeding in 1/4" sheets as fast as I can push them. I want to see how much of my hand I could possibly jam into the blade at full speed like that before it dropped. I'm guessing it would be more than the little tiny nick that the hot dog gets in their old demo.
Kickback is my other concern, specifically when ripping, sometimes the board can warp inward on the blade, which then hurls it at the wall behind you at lightning speed. If your hand was behind the blade, it could get pulled in. That's what happened to my boss, except he was making a plunge cut where you lower the board onto the blade, which makes it a lot more difficult of a cut.
So here's what I'd like to see:
Blindfold a guy (so he can't anticipate the blade contact) and have him rip a 1/4" 2'x4' or so sheet in half at full speed with his hand flat on the top like he's going to draw a turkey. He'll contact the blade with his hand unexpectedly, just like as if he had gotten distracted at the wrong time. A featherboard or two could be used to make sure the rips it in a straight line while blindfolded.
For the kickback test, it would be hard to recreate an actual kickback safely, and I'd be way more worried about injury at the speed it happens, so hot dogs would have to do. I'd like to see one thrown at the blade at a pretty good speed.