It can be installed. But it's not supported, and Adobe has specifically recommended against doing so, and is telling everyone to uninstall Flash before install

It can be installed. But it's not supported, and Adobe has specifically recommended against doing so, and is telling everyone to uninstall Flash before installing Jellybean. So while sideloading it might work for now, most people probably won't bother. And sooner or later it's going to break, anyway. Meaning anyone who's looking to support a mobile browsing experience on Android needs be thinking of it as a Flash-free zone, on pain of being alienated from their userbase.