At least if the child was in school this would be resisted or diluted
Do they h/e both children? You are right, it can be a massive safeguarding issue. On my Safeguarding Course it specifically said that if you wanted to abuse a child, home schooling is the way to go and not register them with a GP either. Once you've de-registered with the LA, they request a meeting but all they need to see are lesson plans and work done by the child. The child doesn't even need to be there.
However I think it's important to remember that home schooled children, certainly the ones I know, the ones I meet and the ones I've encountered on line, all have children that have massively been let down by the current education system.
My own child was massively let down but we were able to get into another school else we would have been left with no choice but to deregister. Going off track slightly, he was severely bullied and the school said it was unfair to exclude the Bully bit felt it more beneficial to teach my child how to cope with being bullied.
It included coming home with shoe marks stamped on his chest and back, torn clothes, spat on, spit all over his sandwiches, having his penis touched and rubbed, pushed over, drawn on and his finger and nose broken. This all happened in Year 2 and 3. The bully was apparently upset as Mom and Dad split over the summer. They told me over and over again not to worry as it wasn't just my child, but they can't exclude him for his own safety. I've since heard rumours he has carried on and has started assaulting Teachers etc. A friend who still has a child at the school said he still picks on children and urinated inside their child's water bottle and tried to get him to drink it after.
Sorry for the essay!