With respect, I think this is misleading.The only information that schools cannot provide to students is the total assessment mark submitted to the Board, as it is subject to moderation.
Whilst the Board advises schools not to provide students with the total assessment mark submitted to the Board (because the mark is subject to moderation), schools are not prevented from providing that information to students, and in certain circumstances may be under a legal obligation to do so.
Most schools are subject to privacy legislation and access to personal information must generally be given upon request. I do not think there is any basis upon which the total assessment mark could properly be withheld.