All MDM policies on Apple devices are actually implemented in the firmware built by Apple itself and any MDM solution only provide web-console user-interface or other mechanism for MDM administrator to enable and configure the require policies to be deployed.   Thus, Soti MobiControl ALWAYS provide day-0 support of any MDM features that come with any Apple devices. 

For PPPC policy, check the "Security & Privacy" MacOS profile payload in your MobiControl web-console.

Add new item for "Manage Privacy Preference" 

The above screenshots are for the latest MobiControl v15.6.   Even if a newly introduced policy has not been included yet in the web-console GUI of an old MobiControl server version, the policy can always been defined by using XML format file within MobiControl custom profile payload.

Your mentioned URL references the "SystemPolicyAllFiles" key, which is described in more details in Apple's online document at

   https://support.apple.com/en-hk/guide/deployment/dep38df53c2a/1/web/1.0

An example XML for use in custom-profile payload can be found at

   https://support.apple.com/en-hk/guide/deployment/dep9ddb7e0b5/1/web/1.0