This in itself is ambiguous and open to misinterpretation - and has been as you say. It's also spreading throughout the NS and has contributed to the some of the recent issues with stewards.
Have not the club flouted the very rules they now wish to enforce by initially 'permitting' the back 4 rows of the NS to stand? Actually, did this really happen or is it some 'myth'? Seems a number of people were told this at the pre season ST presentation.