as far as I know the SELinux container is configured, whether or not the distro uses it isn’t up to waydroid but the packaging and host configuration. If there are issues with the SELinux implementation they need to be brought up.
Waydroid also supports apparmor for some protections when SELinux is not available. OFC it’s not as good as selinux (and currently it’s set in warning mode so it doesn’t actually offer protections out of box, please we need people testing this) https://github.com/waydroid/waydroid/pull/906
If you want to use a VM, and anyone who needs a highish level of security should. Bliss OS is a much better option. Though it doesnt offer “native integration” with the host.
most android apps are architecure agnostic “java, kotlin etc” and even apps that are often ship “Universal binaries” which include x86, or split builds for arm and x86