They were homeschooling the kids, but not for the reason most parents home school their kids. I am sure you have heard the report that the 29 year old adult, which was the oldest one only weight 80 pounds.
I did hear that.
They were abusing the freedom to homeschool to hide their abuse.
It happens, like every freedom we have basically allows for.
However, to portray them as homeschoolers is not an accurate representation of homeschooling.