You may be misunderstanding the usage of the word "private". It doesn't mean that these APIs are obfuscated from developers, it's just that they are only meant

You may be misunderstanding the usage of the word "private". It doesn't mean that these APIs are obfuscated from developers, it's just that they are only meant to be used internally by frameworks created by Apple. Using them directly can result in all kinds of unforeseen behavior because they were never meant to be instantiated or called by arbitrary objects.