the leg bones are bowed because of ricketts, not from congenital abnormalities.
From the article...
“Trinkaus notes that, whereas some skeletal disorders like rickets affect the whole body, many skeletons were found with deformities on only one side of the body.
He also says many fossils in his analysis show no evidence of special rites.
However, several bodies show abnormalities consistent with known genetic mutations, and multiple individuals from at least one site exhibited several different conditions, suggesting the people might be related.
It’s thought that most human populations at the time were small and isolated, Trinkaus says.
In those conditions, inbreeding can lead to widespread harmful genetic mutations.”