Plain fact is all clubs must comply with the rules of the competition organiser (EFL in this case) and the EFL is looking for stronger enforcement in some areas this season (esp. pyros, throwing of objects, pitch encroachment). The club has publicised this online and in match day programmes: "Anyone who enters the pitch without permission and those carrying or using smoke bombs or pyros will now receive an automatic club ban." Clubs get monitored and could face sanctions for non-compliance. The club doesn't want to ban fans so the appeal is for everyone to take note and act responsibly at games.