Appendix 5 of Padmakara Translation Group's Revised Edition of Treasury of Precious Qualities
by Jigme Lingpa.
According to what is written in the above said appendix, any Buddha, or Bodhisattva(s) on (a) certain Bhumi(s), would easily be able to view past events that occured during any given time.
I suspect these three adharma traditions overlap somewhat more than, for example, the older and better-defined Abrahamic ones (which also share a superficial similarity), and I'm sure many stereotypical 'new-agers' are also theosophists, probably without knowing it.
Well, H.P. Blavatsky and Henry Steele Olcott took Refuge, and H.P. Blavatsky's The Voice of the Silence
was printed under the auspices of the Panchen Lama and was also praised by H.H. the Dalai Lama.
About Spiritualism or "new age" channeling/mediumism:
H.P. Blavatsky wrote:
I agree that dream yoga of ChNN involves in part what most people call Wake Induced Lucid Dreaming (WILD).
But it is that PLUS trekcho. A WILD without Dzogchen transmission is not dream yoga.
No because Dream Yoga is also part of Inner Tantra, the Six Yogas of Naropa, etc.; not only Dzogchen.
Though yeah, regarding the other part of what you said, it's as you say: Only Dzogchen has Trekcho and
Different teachings and/or practices may lead to the penetrating of different respective dimensions; meaning that the "astral body" isn't the only Dream Body, as there would also be the mental body, causal body, and beyond
I also agree that OBE is a part of dream yoga, since HHDL mentions the ability to become a perfect spy.
This too:H.H. the Dalai Lama wrote....
Implying that the Disciples attended Vulture Peak in their Dream Body's rather than in the physical dimension.