I don't know...do jinnis even cook their food? And would they use fire to do it? I think it's more likely to be humans who did it. Allah knows best. My main takeaway from this is that with each new archaeological discovery, we get more evidence of human civilization stretching further back into the past...which supports the idea that all these so-called proto-hominids were in fact just humans with somewhat different physical characteristics...maybe different races that have died out. Either that, or the dating system used by archaeologists is not as accurate as we are led to believe.