You are equating anti-Serb sentiment with left-wing bias and that is hardly the case. Separatists who fought the Serbs are not leftists but rather nationalists. The very lies that were perfected against the Serbs are now being thrown around at other nationalists who broke away from Serb domination. This article you posted does not in any way deviate from Human Rights Watch’s perpetual left-wing bias.
What is a nationalist?