It's possible to edit a page on Confluence, and disable the notification for watchers about this change. This is very useful when the page is still under construction, to avoid spamming watchers with multiple notifications about frequent edits on the same page. However, disabling this flag doesn't affect the Slack notification subscription to the page or Space. That said, if the subscription is set to notify about page updates, this update will be notified on Slack. That said, Slack channels get spammed with notifications in this scenario.
Extend the watcher disablement to the add-on integration, so when this flag is off, Slack notifications wouldn't send updates to the channels as well.