The comments of the article say the term "Private APIs" isn't defined in the document. So, even if Apple actually meant "undocumented system libraries", that's

The comments of the article say the term "Private APIs" isn't defined in the document. So, even if Apple actually meant "undocumented system libraries", that's not what its document strictly means. And until a judge says otherwise, we may want to stick with that strict (though silly) interpretation. Anyway, this document changes nothing: Apple was able to arbitrarily ban any app from the very begining. They just want to appear legit.