The action may be alarmist but that's another story.
The Prime Minister is being alarmist, but quoting people verbatim generally isn’t; they are covering the facts of the event, including the fact that the person in charge and responsible for the newsworthy event said this statement. The AFP is not reporting whether the statement is true or false.
They did publish a statement last week regretting they didn't properly mail the mink farmers to ask them about how Covid was going, but said that this failure wasn't important for the monitoring or spread of the disease. If they then knew anything about mink order 66 coming, that's some poker face.
If anyone thinks our government kills off >1000 farms and declares serious lockdown of a good part of our nation (no moving in and out of these counties, no going to work etc.) in a spur of the moment overreaction because of some Facebook sillyness, it is frankly getting insulting.