The Dalai Lama could have easily covered up about what has happened since he has been discharged from the hospital and he can still walk and talk like normal. If in the past he covered up the news about having cancer, why would he want to mention about the seriousness of his illness this time? And if you watched carefully, his facial expression is serious and he seemed like wanting to highlight the fact that his condition used to be serious and he wants people to know that.
Now the question is why he wanted to do that? What is he trying to achieve by telling the whole world that he used to be quite sick? To me, he sounds like those old parents who warn their kids not to rely on them too much and must learn how to be independent and survive. He was reminding the Tibetans that he too can become quite sick and die one day.
Poor Dalai Lama, he must be worried about the future of the Tibetans since China now showed no sign of accepting him back to Tibet. I feel bad for him but this is the result of what he did for the past 60 years. From Tibet to India, he is still the king, and the whole Tibetan community are depending on him for every major decision they make, from spiritual to secular. Even the kanshag now are like puppet, know nothing about leading a small Tibetan community, the only thing they know is to get as much money as they can from their power and positions.
It is quite hopeless for the future of Tibetans in exile under the leadership of CTA in the post -Dalai era.