An interesting thing about Oracle Linux...

  $ ssh me@myol7.myplace.com cat /etc/oracle-release /etc/redhat-release
  Oracle Linux Server release 7.9
  Red Hat Enterprise Linux Server release 7.9 (Maipo)

  $ ssh me@myol8.myplace.com cat /etc/oracle-release /etc/redhat-release
  Oracle Linux Server release 8.8
  Red Hat Enterprise Linux release 8.8 (Ootpa)

  $ ssh me@myol9.myplace.com cat /etc/oracle-release /etc/redhat-release 
  Oracle Linux Server release 9.2
  Red Hat Enterprise Linux release 9.2 (Plow)

I guess Oracle doesn't remove all the branding. I don't remember how CentOS handled this.