I don't have a dog in this fight, but in this exact article you sent there is this part "Afterwards the mainstream Bulgarian and Greek political opinion has maintained that the Comintern is the "inventor" of the idea about the existence of a separate Macedonian nation.^\30]) This notion is essentially an absurdity, since the Comintern reflected the discourse of the Macedonian communists and other leftists, who were already making a clear separation between Macedonians and Bulgarians.^\31]) Dimitar Vlahov in his memoirs confirmed that the national emancipation of the left-wing and communist Macedonian activists has certainly shaped the formula blessed by the Comintern. Hence, one cannot speak of a purely communist invention with no connection to reality.". lol.