This issue is purely informational, you do not need to take any action. Thank you for your work maintaining libnxz in EPEL 8. Red Hat considers this package important enough to promote it to official RHEL. It will be part of RHEL 8.9. Please do not update libnxz in EPEL 8 so the RHEL version can have a higher version and release. When RHEL 8.9 is released, EPEL automation will remove libnxz from EPEL 8 and close this bug.
Sorry for the delay in closing this. libnxz is in RHEL 8.9, and has been removed from epel8.