They are correct though. There is no evidence that chimps walked out of Africa. For two reasons:
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They can't walk for that length of time because we're the ones who walk everywhere, they hang out in trees.
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No one ever said they did.
I'm wondering if this person has ever even seen a chimp, to be honest.
I guess he didn't make it, time travel is dangerous. Even if he succeeded, he probably changed something, and then when he came back, he wasn't on our timeline anymore anyway.
Well if we go by Dragon Ball Z rules, the change will happen in another timeline, and he'll come back to this unchanged one.