I think by that he means the Tankies that see everything in a black and white ‘NATO bad, everything that opposes NATO good, including Russia’ kind of left wing populism, and the ‘Russia is good old capitalist oligarchy theocratic fascism just like we want to do here so we should support them’ right wing populism. From what I’ve heard I think Zizek is probably a lot more authoritarian than me (an anarchist, and a leftist), but if he has enough sense to oppose Tankies then I grudgingly accept him as a temporary ally in the fight against Russia.