Ting is, he's right. Although now the media has a hold of this, technical peados may at this very moment be attempting to hack said watches to follow children, instead of actually just.... following children. Security by obscurity used to be a ting, until we published everydamnting.
Perhaps this is a good ting. Instead of just coming along in your white van and lifting a kid into the back of it as normal, now we should be on the lookout for watch hackers. New set of rules for schools to follow. Ignore white van, but watch out for.... I seen a guy with an IoT bear the other day looking shifty, roll out the stingers and set a curfew.