I've seen this link pop up as a meme on conservative reddit forums for the past month, but with additional text using it to dismiss climate change.
Keep in mind, Australia is huge and has different climates.
While this isn't the biggest fire of all Australia, it is the biggest fire of that region in history by ~10x (according to that wikipedia link).
This is highly unusual.
And as a result of being in populated areas, it has done the most dollars of damage of any fire. This is what climate change advocates are pointing to: increased fires in areas that normally do not have them.