As I said in the comment you replied to, it should have been proactive. What I see here is that there exists a single page of text somewhere on a government website, waiting for parents to find it if they search around. I didn't see anything in that article about parents being informed the school was even using the app, let alone given a chance to ask questions or, you know, consent.

...with a sign on the door saying "Beware of the Leopard"