It makes a lot of sense to move it to guidelines if it is not being enforced anymore.
Otherwise, if there are clear exceptions to the rule which are already finalized, but only not yet published, they should be added to the rule as soon as possible, to prevent further misunderstanding. The exceptions should also be made clear such that each and every member of the community should understand whether the their difficulty name falls inside of the exceptions, such that it is not necessary to search for a member of QAT for explanation.
Otherwise, if there are clear exceptions to the rule which are already finalized, but only not yet published, they should be added to the rule as soon as possible, to prevent further misunderstanding. The exceptions should also be made clear such that each and every member of the community should understand whether the their difficulty name falls inside of the exceptions, such that it is not necessary to search for a member of QAT for explanation.