I have been looking up this method for a long time and I thought I should share it!
So this method IS natural dressage, meaning the horse learns to naturally collect itself and express itself freely with out the use of a bit, however a bitless bridle is encouraged if not using a cordeo (a rope that goes around the horse's neck)
Here are some links if you are interested to learn more:
Nevzorov Haute Ecole
The Art Of Natural Dressage - Without any form of Force, Cruelty, Punishment & Dominance.