No, they said you have to wear a mask if you're unvaccinated, and there is literally no way a kid under 12 is vaccinated because they are not allowed to be and this is public knowledge. There is some grey area where maybe a kid might be 12 but there is a world of children up to say 9-10 who are very, very obviously under 12.
I do hope people mostly follow the rules because if nothing else it sets a really bad example for kids to flagrantly lie and disrespect a place/business/anyone by refusing to follow the safety rules.