Is it an important finding? I think so. It helps shed light on the scientific and technical originality of other cultures. It matters a lot to acknowledge that knowledge does not always flow from west to east or north to south. It helps to rid of the notion of there being 'advanced' and 'primitive' cultures.
Are the scientists from the "Department of Psychosocial Science" trying too hard to make that case? I don't think so. Some people like me thinks this is a newsworthy discovery. Apparently mathematicians would not agree but even so, should they dictate that I should be dismissive of this article as well? The way I see it, the article does not make outrageous or unfounded claims. I'm free to appreciate that numbers have a certain universality as an abstract concept or language that isolated people from different era and backgrounds naturally converge to.