Andreas being a medical intuitive, highly learned, and nobody's fool, it was his moral duty to inform his followers/fans/ that he was sick and, further, to explain why he thought he might have gotten that way. He looked sick on his last video.
Yes, if that is his wife who is still trying to desperately flog his books, that's pretty tacky, but nevertheless Andreas must have known that his sudden, unexpected (by the public, that is) death would cause hardship and confusion all around. What was he thinking.
If he did not have the guts to just come clean about his sickness (it is not a crime for anyone, even a health adviser, to get sick), then I am totally floored.