Well, you could just try it out. You don't need to do a practice for years to see whether it works or not. The goal of Buddhism is peace/joy/happiness, so it's quite obvious that that should also be the goal in meditation. I agree on his comments on noting practice. Noting things is not
the way to a peaceful mind. A peaceful mind is silent and focused. So if Vimalaramsi has done 20 years of noting practice I can understand he is very thrilled about having found out that meditation can be very happy..
Smiling and relaxing are
a way to this happiness, yes. I don't follow this man's teachings but I always have done these things (He seems to think he is the only one teaching about relaxing and smiling, but this is not true), so I could say I imply a part of his teachings in my meditation. And it certainly works.
However, meditation is not about "doing this", "going there" etc. So at a certain point deliberately relaxing is only going to cause distractions because the best relaxation comes from doing nothing at all and just being focused on the breath and stopping the doing, wandering mind. Also on what he says about focusing on the body, what he says about jhana and other things I don't agree. Also his interpretation of the sutta might be a bit strange. Anyway.. you can pick out some wise things from almost every teacher.
This is my experience. I'd say get your own and see if you like it.
Also I must say I have not watched the entire video.