Cutting meat is often used as a way of showing the effect of different techniques and blades. There's a lot of question as to how accurate this is, especially when Lynn Thomas does it to convince you that Cold Steel knives and swords are the ultimate edged weapons in the galaxy, but then again, I don't know that anyone has done much better.
I can't see the video at work, did he say why he was using the meat? Like, what he wanted to illustrate? And did he simulate skin and/or clothing in some way?