No this can be discussed given it's a widely covered news story. However the amount of pseudo-medical opinions and finger-pointing concerning an eight year old child is definitely on the weird side. Maybe being a theme park fan on the internet doesn't give people the authority to discuss a young girl's period, weight, swimwear choices, etc?
As others have said, these sorts of incidents are not uncommon at water parks around the world. I know similar injuries have happened in the past at WNW and I would imagine through sheer numbers of guests over the years it's also happened before at WWW.
There could be a design issue with the attraction, but more than likely it's one of those rare occurrences that can and does happen by virtue of the style and design of an attraction that Dreamworld willingly purchased and operates; theme parks have insurance for this reason.
The most likely outcome is that Dreamworld quietly compensates the family and everyone moves on.