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Surprisingly, the first chimpanzee fossils were discovered not in West or Central Africa, but in East Africa, near Lake Baringo, Kenya. These fossils, consisting of three teeth, dated to 500,000 years in age--meaning that chimpanzees coexisted alongside hominids. The Rift Valley provided no geographical rift for separate evolutionary histories, and therefore foils a key prediction of the human evolutionary paradigm.

Unless this Einstein has made an error quoting the paper, the fact that chimp fossils were found half a million years ago is irrelevant to the primate split 5 million years ago.

Or maybe the author is suggesting some kind of time-travel paradox.

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Topic is from a year ago.

Sally McBrearty, one of the paleoanthropologists who uncovered the chimpanzee fossils, noted, "This means we need a better explanation of why and how chimps and humans went their separate evolutionary ways. The discovery that chimps were living in semi-arid conditions as well as in the jungles seems to blow apart the simplistic idea that it was the shift to the savannah that led to humans walking upright."