Sucrose has a solubility of about 200 g/100 mL water. I’m in American so I’ve never seen Australian food labels, but would they really label a sugar-saturated drink as having 200% sugar? I guess technically you can do that, but it seems a bit weird. In my experience % is usually reserved for liquid in liquid solutions, like alcoholic beverages.

I feel like this is a situation where going full Karen would be an acceptable response.