It seems that what defines humanity has to be a bit refined...
I reckons the article implies the spear was created by the orangutan as it points to Nature articles about tools creation.
Since the discovery of Darwinian evolution, we've understood humanity to be just one more outflow of natural processes (albeit one having its day in the sun). The search for a specific marker of human uniqueness continued for a good century after that, but is fizzling out as we understand more about the nonhuman world, and as the intellectual influence of monotheistic religions wanes. We're a species. We emerged. We'll go away. No essential uniqueness, no destiny.
But as humans are complex systems that are themselves outcomes of a wider complex system, there's not going to be a marker or essence (or 'definition' as the parent put it) of that uniqueness. Rather there's a one or more characteristically human emergent properties and capacities. No new version of 'tool-using' or 'bipedal' or related substitutes for the discarded Christian soul will win out.
No soul, no essence, no destiny. Just one amongst millions of evolutionary branches whose unplanned evolutionary future will play itself out.
Yeah, he used a human stick and needs practise. All those people who can build their own cars and drive without lessons may know throw stones
Me, I'm gonna wait till the second generation of Orangutan's start copying their parents. If they can use this new way of supplementing their diet, we have a real winner.