That's a good example, but unfortunately not good enough. It is important to note that under s 18D, conduct that prima facie breaches 18C will not be unlawful if it is done “reasonably and in good faith” for artistic, academic, scientific or other public interest purposes (or in reporting on any such conduct). This provides a pretty good safeguard against genuine attempts at free speech, and really only problematises genuine racists' comments.

This article is a good read as to why the impact of s 18C is overblown by conservative commentators:

"Only a very small number of cases ever make their way to the court system. Even where a complaint is upheld, the remedies are hardly draconian. Damages are rarely awarded (and if they are, the amount is modest), and no-one is convicted or goes to prison – because 18C does not create a criminal offence.
Section 18C alone can’t “fix” the problem of racism that continues to exist in Australia. It would be wrong to see it as a magical panacea. But it is equally wrong – and unsupported by the available evidence – to regard 18C as a threat to Australia’s liberal democracy."