Seems like your phone is very out of date. You should probably consider upgrading, for security if nothing else. (As in, if your phone is old enough to show the wrong message here, it's probably also not receiving mainline security updates. A correlation, not a causation.)
Up-to-date devices showed "Critical AusAlert".


There might be some third-party version of Android you could put onto it that'd keep you more up to date? I'm not really sure, as I've never had a phone last that long with a usable battery, so I've never tried.