Indeed, that's just one of Dalai Lama's skillful means to create a hype for Dorje Shugden, I mean if he wants to ban Shugden, he will cite reasons like Shugden is a demon, it will harm Tibet's cause, it will shorten his life...etc, so far we can see that Tibet is a lost cause, so that will be conveniently blamed on Shugden, but about the Dalai Lama part, he is still very healthy and no sign of passing anytime soon. For a 76-year old man, still traveling around the world giving teachings non-stop is quite a magnificent feat.
So of all the reasons that Dalai Lama cited "bad" about Shugden, some "came true", some does not...So the Dalai Lama is wrong in his prediction? Wrong in his perception of how harmful Shugden is?
The irony is, as the Dalai Lama lives longer (we hope so), his reason of banning Shugden (shortening his life) weakens...