thinking about the ethics of stealing IP from a cancelled person's body of work. well – it's subtler than that. referencing themes and idea forms from someone whom you would explicitly point to as an influence if they were ingroup/zeitgeist approved. "ghost/shadow influences"
The ideas of "Feelings of Inferiority", "Oversocialization", "Power Process", "Surrogate Activites", and the interplay between Freedom/Technology/Power can lend a lot of clarity to what's happening nowadays IMO. I don't think it's influential though, at least not in my circle.