That seems histrionic...what rewrites or dynamics are going to be significantly changed? I mean, it's a fascinating discovery and all and thank gawd our ancestors were so clever. A timeline or two might get updated, but the headline seems to be "culture that left little evidence of their existence figured out how to make steel to make marks on hard rocks; no one else picked up on it for a millennia or two". This isn't by any means the first time we've found some ancient culture figured out something really neat earlier than we expected but it didn't go anywhere at the time.