This is BS. As someone with several kids who use chromebooks, it became much better for the kids when more active monitoring and blocking came in. Just as a practical basis, they were less likely to get distracted or wander into areas where they shouldn't, when they shouldn't.
Okay, so if it blocks something that is potentially useful? Don't care. At school they should be learning the curriculum presented by the teacher. Want to learn something specific? Go to the library or do it at home.
Seriously. This article is extremely messed up and weak.