If Macedonian language is indeed a modern Slavic language, closely akin to Bulgarian (to say nothing of the long dispute on being or not a dialect of Bulgarian), Bosnian is not a language. If so, I would expect handbooks of Austrian and Swiss languages. Are there?
I would warmyl recommend the creators of this useful language-learning methods to abstain from politicizing such issues. The situation is far from being totally normal and calm in the Balkans, and there is no reason for Kosovar or Bosnian or Austrian or Swiss language handbooks. Let us be serious and responsible, and not re-kindle such recent disputes.