I wouldn't be surprised if time travel is real. Humans have yet to discover how black holes work, and how to manipulate them. But as time passes, I'm sure we'll eventually be able to time travel, but not anytime soon. As for the guy, dude gotta be smokin something. I doubt his story is true, just wants to attract attention and fame for his own personal gain. Time travel is very possible, but no one has the time and money to go to outer space and jump in a black hole. We'll never have a nuclear war, cause most of them have been deactivated and were not that stupid to go and commit suicide... I think.
Time travel gotta be real, if people say otherwise, they don't have much imagination.