> I find it telling that the author just decides Žižek has 'lost the plot' on the grounds of a single essay he wrote because it doesn't agree with her politics.

I didn't get that from her article. Specifically she found it to be "boring, unoriginal, dishonest, and lazy." The argument that Žižek is making seems lost in the piece, or at least not well laid out. This may be his style in general, and maybe there is some hidden insight somewhere. But it seems mostly akin to McWhorter's work that he sights. Unoriginal at best, harmful at worst.