The people he cites as authorities in cultural studies are the superluminaries of the field, the quotations he uses to illustrate his argument are strictly accurate and the text is bristling with footnotes.
Many scientists believe that the emperors of cultural studies have no clothes.
But Sokal captured the whole royal court parading around in naked ignorance and persuaded the palace chroniclers to publish the portrait as a centerfold. Once the article was safely in print, Sokal revealed his modest experiment. Unfortunately yes, and Sokal's deliberate nonsense is anything but subtle. Under the theory of social construction, there's not even a tree. Either this is a parody or the author is off his rocker.