I'll give Zizek credit and assume he has entered the dhamma through one of the over 84,000 gates. Regardless, Zizek has a skewed interpretation of śūnyatā. He perhaps is showing early symptoms of what Zen calls "sunyata disease", or zen sickness. That is to say, Zizek has only glanced over - not tamped down his ego - the first turning of the dhamma wheel, vaguely understands - in the mind-only sense - the second turning of the wheel (sunyata as void, an abyss, a nothingness), and arrives at the third turning without fanfare - void of compassion and wisdom (buddha-nature).
Like myself, Zizek is participating in what can be called 'crimes against wisdom'. He will suffer the corruptions of insight for a long time.