When I was in college, postmodernism, Derrida, and continental philosophy were the rage. I studied all of this, with the exception of Foucault. It piqued my curiosity, therefore, when I saw a reference to them, particularly because a lot of what they did has been warped into other things which suit contemporary writers/thinkers (Judith Butler is a prime example of trying to incorporate Derrida’s ideas into her theories, yet doesn’t understand them at all).
If the writer of an article such as the one you cite is going to include a link to a piece about Derrida and Foucault, saying we have them “to thank for the idea that
there is no objective truth,” the writer should first take the time to read the actual article. The synopsis even states: “The pair are commonly cast as absolute moral relativists for whom there is no truth whatsoever—a position which not only did they not argue, but were at pains to disavow.“ This reflects very poorly on the author.