Oh, I didn't remember we had this method. From Ibai's comment on the bug, the definition of outdated we want is the one we use here:
https://github.com/mozilla/kitsune/blob/master/apps/kpi/cron.py#L318

So instead of looking for MAJOR update, we just want to ignore the TYPO updates and include the MEDIUM ones. Might be useful to make that a method we can reuse in the cronjob above.