It's just a very narrow rule. The government has an explainer on it (https://www.fairwork.gov.au/employment-conditions/hours-of-work-breaks-and-rosters/right-to

It's just a very narrow rule. The government has an explainer on it (https://www.fairwork.gov.au/employment-conditions/hours-of-work-breaks-and-rosters/right-to-disconnect https://www.fairwork.gov.au/employment-conditions/hours-of-w...), and their example of after-hours contact which might be legitimate involves 3 hours of document preparation due the next morning.