IMHO he is an idiot. Folks like him do not want kids to learn a lesson in anything but handouts.
You're right, far better that the kids learn that in a team sport, it's a good idea to try to bend the rules instead of actually playing the game everyone showed up to play. Even better, the coaches need to try to out-do each other with tricks like that instead of actually teaching their teams how to play, since the point isn't about playing the game anymore.
May as well start slashing bus tires so the visiting team defaults when they can't get to the game. Same non-game tactic, same result, same lesson taught to the players, most of whom just want to play ball.
Don't like the illegality of slashing tires? Then just pop the hood and disconnect the battery under the motor where it attaches to the block. Hard to troubleshoot and repair in time, and no real damage done, haha it's just a joke see how cool I am! Jerks.