package was in epel7: https://dl.fedoraproject.org/pub/epel/7/x86_64/Packages/l/luarocks-2.3.0-1.el7.x86_64.rpm
Packages in the EPEL-8 repository are volunteered by Fedora packagers via requests by interested users. Just because a package is in one version of epel does not mean it's in all of them.
In this case there's already a request for this, see:
https://bugzilla.redhat.com/show_bug.cgi?id=1760698
and follow along there. :)
Metadata Update from @kevin: - Issue close_status updated to: Unable to Fix - Issue status updated to: Closed (was: Open)
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