If true, then this just goes to show that no matter what you do, actions always have consequences (or potential consequences) well intentioned or not. All things being weighed up, I think the club has been right to limit Grimsby's allocation but we'll have to wait and see what happens.
If Notts were to lose AND you had a serious to-do between rivals fans, then the next time the club finds itself in this position, it's going to feel obliged and come under pressure to hand over the whole stand, with no guarantee of a better outcome.
If Notts win with little or no bother, then the decision will have been fully justified, but the more successful the club - the more problems of this nature you have to contend with.
In our defence, we haven't had a great deal of practice in recent years when it comes to large away followings in high-stake scenarios.