No mention of the word sacrafice, disgusting sanitizing of a horrible culture.
Because there’s no evidence they were sacrificed. That’s literally the only reason it isn’t mentioned. They probably died the same way so many other infants, children, and toddlers died at high rates, up until recent generations, and got a somewhat fancy interment because of the social status of their family.
No evidence of it either. Perhaps those young people died of a disease; and, this form of burial was a community effort to honor them.