If my math is right, each team had roughly an entire other team of players on the bench (10-11 players) and since this is a U-20 team, there's a good chance they still have some fieldable players in their training pool. Mamore declared they don't have enough left to field the minimum 11 for their next match though. As for red cards to board members, it's not entirely out of the ruleset, as coaches can and have been expelled.