Ah, I see. So, that's a debug feature - it will only work if you run the game with the 'Origin -k' commandline parameters.
I do remember people from Origin explaining (in a chat transcript - it's probably downloadable from the CIC somewhere) that WC2's AI adjusts its difficulty level towards the player. The better you play, the tougher it gets, and vice-versa. But I always wondered if that was a real feature or not, because I simply never noticed any significant impact on the game difficulty.