Im not an expert in eastern or western religions or demonology but I am skeptical of this.
Yoga is merely an exercise. You can argue it clears your mind of stress and is very close to meditating but the same thing happens to me when I am doing an activity that requires intense focus. When you are doing yoga you are focusing on your body and balance and flexibility.
I get much closer to meditating when I am sitting in a tree stand listening to the woods.