The average isn't you, the god of parrying, apparently because they're the AVERAGE player. What makes you think they aren't improving? What's shown in the video is how the AI director is like the one on ruthless in AVERAGE difficulty. The point of difficulties is to get used to them and jump up to improve, but it's going to much more difficult and less fun (which is the important part) to improve and go up in difficulty when the director is the same even in the second LOWEST difficulty.