Yes, what in the world does he mean by are all purported to be "official languages" ? Is the situation so confused that he can't tell if they're official or not?  

 On the other hand, the BiH entry in ELL2 says that all three are official languages. The only problem is that there is so little detail that it's hard to know if this actually contradicts the other ELL2 article, or if it's simplifying matters by letting the names of the language stand in for the language. Arzoz has a similar problem. On the other hand, if the three were all separate official languages, why would they bother to say any more than that? So we're back to being effectively unable to tell what several of our sources actually support. —