Although Geshe Kelsang refuted this smear in an interview in 1997. Tenzin Peljor and others continue to spread lies about Geshe Kelsang’s retreat in India. The letter referred to in the question is the Sera Expulsion Letter.
Q: Geshe-la, in their letter it says that you suffered from chronic TB while living in Mussourie, India, and you did not do long retreat. Can you clarify this, please?
GKG: I did a long retreat for many years in Nepal near the border of Tibet in the Himalayan region. The place is called Bangthog Damthang, and I was sponsored by my sister Dekyi who is now living in Switzerland. Later, I did many long retreats in the Dalhousie mountains near Dharamsala.
In Mussourie, every winter for several months I did retreat. When I was not in retreat I was trying to help families by performing healing rituals and special pujas. Before I went to Mussourie I lived in Buxa and fell sick there with recurrent chest infections, but it was not serious. Later, in Mussourie the chest infections continued to recur, but I was never admitted to hospital. In this life, I have never spent even one night in hospital! My relatives in Mussourie were urging me to have a thorough check up so I was examined by three different doctors. Two of them said that I had no disease, but that I needed to build up my bodily strength, and one doctor said that maybe I had TB. In reality it was difficult to understand the real problem.
Later, when I was living in England, I experienced continual physical weakness until finally I went with two Western assistants to London for three weeks and was examined by two specialists. They took many X-rays and did many other tests. The final result was that both doctors said there was no disease, just lung weakness. They said I needed fresh air, sunshine, exercise and rest to build up my strength.
More about this on the New Kadampa Truth website Smear: Geshe Kelsang didn’t do retreat in India, but was sick