You're right. Postmodernism isn't a relevant philosophical movement since the 80s at best (some would argue it wasn't a movement at all, just a term used by simple minds to join multiple philosophers who rejected meta-narratives but all had very different point of view on everything else). I don't understand why in the past 15 years everyone talk about it. My understanding is that it's often people who never read Lyotard and misunderstood Derrida (I don't have the English word for 'contresense', basically understanding the opposite of what is said. I heard someone say 'you shouldn't criticise art with the standard of the current time' to attack Derrida's ideas lol. Which is fair, because Derrida was a cryptic asshole on purpose, but he did teach in English and his lecture are publicly available, and almost clear.)

Also, the last 'representant' was Baudrillard, and he died in the early 2000s, probably a bit sad that 'Matrix' misrepresented his philosophy so much. Baudrillard never worked on consciousness, but if he did, I think he would be a materialist (an illusionist probably. At least reading his books made me one, and hopefully I didn't misunderstood him).

This paper doesn't look like continental philosophy at all though, so I don't understand why postmodernism comes up.