Yes. When it is not recommended to go deeper without counseling or personal guidance it is specifically stated as e.g. in the use of Kundalini sadhanas.

Yes. Although the yogic system has to be treated as a whole it does not hurt to use it as a starting point.

Yes. There are numerous scientific studies to support that claim and some of those are cited in the Ebook. The positive effects for depression patients for instance are profound. The rewiring of breathing has a substantial effect on the imune system.

Yes, it can be. The nonconformist but on the scientific method grounded approach by Spiritual Punk provides a safe platform to reach out to get information outside this realm.