They made 11 changes from their last match.I think they have to play at least 7 players that played in the last competitive match or they get a fine (which I believe is quite disproportionate). It's done so the youngsters are able to play against proper teams.
Personally I'd be fuming if we were under this and whilst I want our youngsters to do well, it's a joke we have a team in this competition. Alongside all the other U21s teams.