How does this stuff get published?
They analyzed data from 258 individuals who lived over a span of 250+ years and expect us to believe those detailed demographic characterizations. ????
The only thing they should credibly conclude is that people in the small sample buried there tended to be older if they lived after 476 AD.....and we don't know anything about those who didn't wind up in these graveyards (which was probably the majority of the population).