Many of the facts mentioned and described by Zasep Tulku Rinpoche's biography is not something totally new, including Dorje Shugden is the one who has saved HH Dalai Lama's life, and what route to take to escape safely. Information as such have been shared by dorjeshugden.com.
I summary, Zasep Rinpoche in his biography mentioned that:
* Dorje Shugden practice is something dear to his heart.
* HH Dalai Lama heeded the advice of Dorje Shugden via Panglung oracle, hence he is able to escape and arrived safely in India.
* When mentioned about Gelug, Kagyu and Nyingma all live together peacefully, doing prayers togetehr in harmony. Only after Central Tibetan Adminstration come in to divine and rule, the Tibetan community has turned into a divided society, as you can see now. Hoping that one day all the lineages can live together with HARMONY, regardless one group of people is practising Dorje Shugden or not.
* CTA is the culprit behind the Dorje Shugden ban to divide the Tibetan community.
* Sakya lineage has history of practising Dorje Shugden. Dorje Shugden is not SECTARIAN, if not why non Gelug lineage people won't be practising Dorje Shugden, unless they are receiving blessings from Dorje Shugden.
It's glad to have record re Dorje Shugden as such in a Rinpoche's biography, which speaks in details. Many resource can now cross check.