Thanks @stevedennis,
this is the information returned:
[
    {
        "purl": "pkg:deb/pacomalarmprocessor@7.2.1.0-1?arch=amd64&component=scati&distro=bionic",
        "name": "pacomalarmprocessor",
        "version": "7.2.1.0-1",
        "qualifier": "arch=amd64&component=scati&distro=bionic",
        "totalDownloads": 0,
        "downloads": 0,
        "published": "2024-05-14T07:40:58.73Z",
        "publishedBy": "Admin (API)",
        "size": 7088772,
        "md5": "f9b5cac473e1539824486ec76c8515b7",
        "sha1": "43e2493ee4fd6f6284c225bda574da8f884597ea",
        "sha256": "aa51e0cff448c3df2fcc509fb7f223fa600ed129c81a15b5f1c15e2f34dd0f1f",
        "sha512": "38d6cdfb91a052edddf1452c763f8cc83845f896a9fa7e5c6539071ad0f17be5188d7c39ff41b5690eb89e08527eac5dfc23d2355dfb4050986570b086ef2b61",
        "versions": [
            "7.2.1.0-1",
            "7.2.1.0-1"
        ]
    }
]
Odd or not, it claims that I have twice the same version 7.2.1.0-1. I presume that's because I have one bionic and one jammy version.
This is the list of files in the Web UI:
Files
Name	Size	Published	
bionic/scati/pacomalarmprocessor_7.2.1.0-1_amd64.deb	6.922 KB	14/05/2024 9:40:58	
jammy/scati/pacomalarmprocessor_7.2.1.0-1_amd64.deb	7.913 KB	14/05/2024 9:37:31	
According to the returned qualifier I tried other options, but it still fails:
pgutil packages delete --source=scati --feed=stable --package="scati/pacomalarmprocessor" --version=7.2.1 --qualifier="arch=amd64&component=scati&distro=bionic"
pgutil packages delete --source=scati --feed=stable --package="pacomalarmprocessor" --version=7.2.1 --qualifier="arch=amd64&component=scati&distro=bionic"
pgutil packages delete --source=scati --feed=stable --package="scati/pacomalarmprocessor" --version=7.2.1 --qualifier="arch=amd64&distro=bionic"