I wouldn't say people are incapable of noticing the difference. most people just don't care as much as a very vocal minority of the population seems to. especially people watching shorts. nobody watching shorts is looking for quality, they're looking for short videos that don't outlast their attention span. it doesn't matter whether or not something is AI, all that matters is it engages them for ten seconds or so till they scroll to the next short, and keeps the dopamine flowing.