The AI is the thing being taught, not the thing teaching a class. Once you have a model, $0.01 is the correct order of magnitude for the cost of generating an image from a prompt. If anything it's an overestimate.
it's barley short of what a 1920x1080 image costs from openai, but we're in a thread about instructional video, which is neither economical nor available yet
Video would cost more than still images for the obvious reasons, but still likely much less than the cost of however many frames per second times that number of images, because nearly all of the frames will be minor variations on the previous frame. Meanwhile it's going to be a couple years before that technology exists because you'd have to develop something that can sync video with audio etc., by which point the hardware would be more power efficient.
So now we're speculating on the cost of something that doesn't exist yet, but it's highly likely that hardware is going to get more power efficient over time, so the question then isn't whether "AI can do this for a lower price than humans" will happen, it's just a question of how long before it does.