I belive you are mistaken. Firat of all, some part of Android is updated via the store. So the Chrome vulnerability and system libraries were probably updated

I belive you are mistaken. Firat of all, some part of Android is updated via the store. So the Chrome vulnerability and system libraries were probably updated without you noticing. Also, this started in May. Before it went public both Apple and Google had already patched some vulnerabilities. Latest round was in August/September.