yoga does not stop with physical exercises. The book Hindu Manners, Customs and Ceremonies relates the experiences
This is where the Awake! Goes amiss. Yoga is not Hindu. You can apply Hindi customs and religious beliefs to yoga, but yoga welcomes that from any belief system.
So this quote becomes a classic red herring argument. Do not drag the reader into believing that strange Hindi customs such as holding breath until hallucination is yoga.
Anyone who practices yoga would scoff at the quote anyway because breath control and flow (deep breathing techniques) are essential to the practice.