[mcbits]

That's an ambiguous/misleading "and" in that sentence. Modern humans date back to around 200,000 years ago. And it's thought that there was a great migration from Africa roughly 50,000 years ago. Presumably the Sentinelese ancestors were part of that migration, since they are quite far from Africa. Though I agree that it's worth asking how much the population has diverged after 50,000+ years.

[ikeboy]

Thanks for picking that up, I had misread it as saying both happened then.