content: The article says nothing about them not using SELinux, which they developed together with Red Hat (and who are the main developers now). Also RHEL runs with SELinux on by default:  Security-Enhanced Linux (SELinux) adds Mandatory Access Control (MAC) to the Linux kernel, and is enabled by default in Red Hat Enterprise Linux. Also, by default, SELinux targeted policy is used, and SELinux runs in enforcing mode.