Morrison has consistently opposed the harshest lockdowns and many of the others. He hasn’t opposed all of them in every single situation.
In recent weeks, he’s been more conciliatory towards the state governments imposing lockdowns because he’s trying to get them to cooperate - it’s the only thing he can do to ameliorate what they are doing. Constantly criticising them on every single issue just makes them dig their heels in. He’s between a rock and a hard place.
The Constitution gives them the power - all he can do is try and persuade them to change their mind and attacking them all the time doesn’t do that.