The Liberal party has only held a majority in their own right once in their 80 year history, the 1996 election of John Howard.
But, as was already pointed out, this is satirical. However I feel like it's gearing up for the Coalition's response if Labor ends up forming government with the Greens, which I feel like is more than just an outside chance.
Technically it's only compulsory to have your name checked off the rolls and put your ballots in the boxes. What you do in the booth is between you and the goddesses.