The physicist Sokal published a paper in a leading postmodernist journal which he later revealed to be full of nonsense. He used this as evidence that postmodernism itself was nonsense. This conclusion does not follow from Sokal's evidence.
Sokal demonstrated that a postmodernist journal would publish a paper full of nonsense. A paper full of nonsense passed peer review and was published. Now Science and Nature have published articles that were clumsy frauds. These fraudulent papers passed the peer review of the two jounral that are regarded as the most prestigious in scicne publishing.
So Science and Nature have published nonsense in the form of clumsy frauds. Postmodernist journals have published nonsense in the form of Sokal's deliberate hoax.
Soka;'s comnclusions do not follow from his evidence