This is something that narcissists do that I only found out last week. I decided to check out some of the people whose clips were used in the Reclusive in Renton video (which is a banger of a video btw) and stumbled upon this one.
I timestamped the part relevant to this, but the whole video is really good. The part I timestamped in particular was a revelation to me, before that I thought that he did things like use "inclusive" to mean "exclusive" because he did some weird autistic word combination thing, so in- from insular and -clusive from exclusive formed "inclusive." Another example is back when he misused compiled to mean a combination of com- from compounded and piled as in the phrase "piled up." Turns out he simply used those words incorrectly just because it sounded similar to another word that he knows. From the video I found the "etiological means something similar to eating" example the psychologist gave hilarious. It sounds like something DSP would misuse in the same way while doing a Feeding with the Pig. Mmmmmm that dish I'm eating is so etiological and flavorful!