They need to do more due diligence on the cause before announcing the cause, but they don't need to do more than confirm users are having problems to update the status page that problems exist.
Even assuming they can't instantly see the problems in a dashboard and need to take time to understand user feedback to see which aspects specifically are affected to update the page in more detail, nothing is stopping them from very quickly putting a "Connectivity issues reported by some users, investigating the extent and cause currently" banner at the top of the page which should be ready to go at a moment's notice anyway.
Even assuming they can't instantly see the problems in a dashboard and need to take time to understand user feedback to see which aspects specifically are affected to update the page in more detail, nothing is stopping them from very quickly putting a "Connectivity issues reported by some users, investigating the extent and cause currently" banner at the top of the page which should be ready to go at a moment's notice anyway.