Is that:
https://www.abc.net.au/newsa legit site which blundered or is it a fake news site?

I do feel sad for the guy which solar panel installation shuts down because of over voltage, but my first question would be if it is the right system and rated for Australian Mains voltage instead of the Cheapes Chinesium.
If they all start adding transformers in the way Big Clive suggests, this wont happen, but Australia has lots of sun and everybody's solar panels pushing more voltage onto the mains could become a big problem if enough people start doing this.
Worldwide unified mains Voltage (and frequency and plugs) is a good thing. The world is just getting too small for all this shit.
Even in the Americans, where inches are still being used, it seems that split phase transformers to upp the nominal 110Vac to somewhat near the worldwide more common 230Vac seems to become more common.
Edit:
Glanced at some random articles on that ABC news site and it does not seem to be much better than those notoriously bad Brittisch pulp news sites.