In bug 2170842 it was uncovered that users are able to install LibreOffice through GNOME Software on aarch64 even though the LibreOffice is shipped without GUI to cover only headless use-cases (on s390x as well) as opposed to other architectures that contain the GUI as well. The .desktop files on aarch64 and s390x contain "NoDisplay=true" in the .desktop files which generally should be enough for appstream-builder to not populate the metadata that are later used in GNOME Software for the applications availability. The problem as uncovered by Richard is that currently appstream-data is build as a noarch package - https://gitlab.com/redhat/centos-stream/rpms/appstream-data/-/blob/e9fd1ad9a6cdc300be95c8fcf5322305f2d4f1f3/appstream-data.spec#L9 - so it doesn't have any notion about these arch specific differences. The solution might be to build appstream-data as a archful package which has its downsides as well.