So far no proof. What major news event will happen tomorrow? You have a time machine. How hard can it be to prove it this way?
If he uses it, he will disappear from this timeline and return to a different one.
He's predicting a Nuclear war. And you're saying he can't predict what will happen tomorrow?
Think about it, though. We can all try to predict what will happen tomorrow and have a good chance of getting it right. For instance, I could go out on a limb and say Joan Rivers will die tomorrow. If it happens, am I time traveler?
He's going to have to supply more ample proof. So far, he didn't really answer my questions.