Nyoshul Rinpoche said something interesting about the hidden yogis: “Even in this world, and even now, there are said to be many hidden yogis or discreet yogis, called bepay naljor in Tibetan. It means those realized ones who are not generally recognized as great spiritual beings, but have deeply tasted the fruit of enlightenment, and are living it. Perhaps they are anonymously doing their good works here among us right now.”
I have met many such Hidden Yogis in India, Canada and United States. There is no air of inauthenticity around them. However, it is not hard to recognize them too!