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We have create time machine since 2001, or 2000. Since the scientist make the mini black hole on SPEARS, the particle accelerator.
In interdimensional means, time travel are possible through Astral plane. Just google it, astral plane/astral projection. Im too lazy to explain it here, it will be miles of typos [xx(]
You are using the term "what's happened" but, if this guy goes back, for him there's an element of "what's going to happen" AND "what's happened", too, about the same event.
Could it be something to do with ' how do you get back ?'...unless you can travel with your time machine how can you activate it in the past (before it was invented) to bring you back ?
Lee, what you descrobe is what I referred to as parallel universes. There is EITHER paradoxes OR sets (probably infinite sets) of parallel universes. A traveller who changes something in the past can only return to a universe where that change was made (by him) and not to the universe from which he started. This is logically correct but, although attractive from a Schrodinger cat point of view, I believe is not sustainable in many (if any) of the Quantum Theories that study such matters more deeply - I think there is a problem with the total energy. It would also be a pain if you trod on a blade of grass that somehow changed the world to something unrecognisable when you return to the future. This concept has been explored by many SciFi books.
I'm a great believer in the simplest explanation being the most likely. The simplest explanation in this case being what I said. It takes but 1 premise - that if you travel back from time B to time A, then from time B's perspective A->B happened the way it did & cannot be altered. Bifurcation & conservation of energy are irrelevant.
But he did exist at time A because he went back to it. He just hadn't been born yet.