Update: I emailed the administrator of the school, got no traction there. Followed up on Facebook messenger with the school district's facebook account, got no traction there. Made a twatter account and twatted "Hey <school district>, why can I log into strava and see the home addresses of the entire 6th grade class at <school>?", and tagged the school district, their "ed tech" account, and strava.
This morning, there was a response from EdTech asking for more details, so I emailed them.
Also found out that the current superintendant is an alum from the same high school as me, so I have an in there, should I get no traction via this channel.