What is the difference between Repo-pkgs and Repo-available-pkgs?

Issue

Different number of packages "Repo-available-pkgs" versus "Repo-pkgs"

Repo-id            : rhel-8-for-x86_64-appstream-rpms
Repo-name          : Red Hat Enterprise Linux 8 for x86_64 - AppStream (RPMs)
Repo-revision      : 1603477474
Repo-updated       : Fri 23 Oct 2020 06:25:50 PM UTC
Repo-pkgs          : 12,214
Repo-available-pkgs: 10,407
Repo-size          : 27 G
Repo-baseurl       : https://ktordeur-sat67.sysmgmt.lan/pulp/repos/Default_Organization/Library/content/dist/rhel8/8/x86_64/appstream/os
Repo-expire        : 1 second(s) (last: Mon 26 Oct 2020 11:27:15 AM UTC)
Repo-filename      : /etc/yum.repos.d/redhat.repo

The repository is synced and no issues are encountered on either external Capsules or on Satellite nor is there any problem in the Content View. What causes some packages to not be available for installation on the Content Host?