Yes this is exactly the point. With kill switches you can make sure that the child can’t go online, make a call, or record themselves accidentally by launching the wrong program on the phone.
Obviously a child who wants to violate their parent’s wishes could flip the switch back. One of the most challenging security threats to model isn’t a nation state adversary, it’s a child restricted by parental control software because they have almost unlimited resources (time) and almost unlimited imagination. A child violating their parent’s wishes is not a technology problem, it’s a social problem and social problems solved by technology are solved poorly. It’s an issue best solved by parenting.
By the way, have you noticed that a parent’s default approach to protecting their child’s security with technology (lock up the device to tightly restrict what they can do with it, and track every step they take) is exactly the same approach Big Tech implements to protect an adult’s security? This is because Big Tech companies look at their customers as children that must be protected from themselves by removing as much agency and control as they can. Of course this also conveniently makes their customers completely dependent on them, like children.
We of course think differently and take a different approach.