Nope. As you've pointed out, in parts of Queensland, 90% of the people who had COVID didn't know it. If they had been vaccinated, they are far less likely to have been infected in the first place or infectious.
That's how vaccinations work.
The current vaccine works well to reduce the severity of disease and likelihood of death from omicron, but I do not know about what percentage of the people on the Gold Coast who tested positive were vaccinated.
Two surveys conducted on the Gold Coast late last month reveal more people are living with the virus than reported, with authorities to conduct random tests this weekend to better understand the pandemic's extent.
www.abc.net.au
Most people in the study with mild or no symptoms were fully vaccinated.
This indicates that the vaccine has the possible effect of making infected people asymptomatic when they otherwise would not have been, and an asymptomatic person with omicron is surely
more likely to not know they have it and be out and about versus a symptomatic person who at least has some reason to believe they may have omicron.