"NoAutoUpdate" value should be set to 1 in order to prevent the automatic updates, atm it's been set to 0 which is the opposite effect as it enabled auto updates.

https://github.com/builtbybel/privatezilla/blob/master/src/Privatezilla/Settings/Updates/DisableUpdates.cs:
Registry.SetValue(NoAutoUpdate, "NoAutoUpdate", 0, RegistryValueKind.DWord);

https://docs.microsoft.com/de-de/security-updates/windowsupdateservices/18127499

PR: https://github.com/builtbybel/privatezilla/pull/50/files