Well of course, they have rules preventing it. No one's saying "you can't have rules that ban AI from demoscene" or "Demoscene must use AI." There are also exhibitions where chess pros compete against machines.
This isn't about a chess pro competing against a machine, this is about someone showing up and saying they're going to enter the competition but instead they run a chess program, and claim that they played against the chess pro and beat them.
