Unattended-Upgrades configuration for custom repo only

OS: LMDE 5 (based on Debian 11 Bullseye) To keep the system tidy, I use separate files to overrides the original distribution/developer configuration files wherever possible. This also prevents problems when the developer makes changes to the original config and keeps my settings safe. etc... For Unattended-Upgrades, the original configuration of /etc/apt/apt.conf.d/50unattended-upgrades:

Unattended-Upgrade::Origins-Pattern {
//      "origin=Debian,codename=${distro_codename}-updates";
//      "origin=Debian,codename=${distro_codename}-proposed-updates";
        "origin=Debian,codename=${distro_codename},label=Debian";
        "origin=Debian,codename=${distro_codename},label=Debian-Security";
        "origin=Debian,codename=${distro_codename}-security,label=Debian-Security";

I replaced it with the file **51**unattended-upgrades:

Unattended-Upgrade::Origins-Pattern {
        "site=myrepo.example.com"
//      "origin=Debian,codename=${distro_codename}-updates";
//      "origin=Debian,codename=${distro_codename}-proposed-updates";
//      "origin=Debian,codename=${distro_codename},label=Debian";
//      "origin=Debian,codename=${distro_codename},label=Debian-Security";
//      "origin=Debian,codename=${distro_codename}-security,label=Debian-Security";

I thought the entire original section would be replaced with my section and UU would **only** update myrepo.example.com. But it turns out that all 4 repositories are active:

"site=myrepo.example.com"
"origin=Debian,codename=${distro_codename},label=Debian"
"origin=Debian,codename=${distro_codename},label=Debian-Security"
"origin=Debian,codename=${distro_codename}-security,label=Debian-Security"

How can I disable all other repos and only have myrepo active **without changing** the original 50unattended-upgrades?