Just an idea. If Craig Wright is NOT Satoshi Nakamoto, he would definitely risk the real Satoshi come up with a proof, that Craig is not SN. Is it possible, that CW explicitly knows about the death of the person behind SN, so he can make his claims without backing them up with a proof?

Or maybe he did it because he knows that the true Satoshi wouldnt do anything or say something about it. There are lots of people that already came out and claimed to be the real Satoshi before Craig came up with those claims of being the real one. So if the real Satoshi is still alive and never did anything about it, that would give him the courage to go ahead.
So, I am not really saying that hes alive or that hes dead, hence I have nothing to prove it. Satoshi might be out there and even enjoying his life and watching whats happening but we are here unnecessarily worrying too much about it. I mean to say everything is having 50% of chances and knowing the actual truth must be too great rather than simply living out of assumptions.