More likely some back-room deal has been done with vested interests and the implementation of this policy somehow benefits them (financially or politically).
It is likely a combination of: rightsholder companies who will eventually twist the filters to block internet-based competition, large IT contracting companies who will get lucrative contracts for implementing it, and (tin-foil hat time) the Catholic church.
There are some VERY skeezy links between the federal opposition and the Australian Catholic church which see the church hold significant lobbying power over LNP policies. See: marriage equality, abortion rights, royal commission into child sexual abuse etc.
As a small, uncontroversial example, the current government handed over regulation of charities (including churches) to an independent regulator last year. The Catholic Church in particular hates being under the thumb of a regulator it doesn't have in its own back pocket. Conveniently the LNP plans to scrap the regulator if they win the election. Even mainstream newspapers are reporting that this is at the behest of Cardinal George Pell:
http://www.smh.com.au/business/bad-liberal-policy-will-damag...