The supposed ignorance in Sydney by people over Covid issues, in my opinion, has nothing to do with language. It has much more to do with cultural preferences and background.
If I was in a foreign country and did not understand the language, visual clues and pictorial content on TV, posters and billboards would be sufficient to tell me about how to keep myself safe and how to become vaccinated.
Many Australians with their origins from overseas won’t vaccine, won’t keep away from large family groupings and will not take the precautions or follow the recommendations of health authorities and government.
Thanks to this attitude, the way out of Covid, especially in locked down Sydney, will be a slow burn.