The policy is still in effect but you cant use it to get steroids into the country. The FDA importation policy does not allow you to import drugs without a prescription. Like you said this loophole was created for HIV sufferer's to use medication that had not yet received FDA approval. They still either require a foreign prescription or a prescription from the US doctor who will be over seeing your treatment.
Plus the policy also stipulates the medication must be for a serious condition for which there are no good alternatives. You might be able to argue the no good alternatives but the FDA isn't going to buy needing big guns as a serious condition(even though it is). Not to mention steroids are available in the US, so theres no reason for a legitimate medical user of steroids to need to import a personal supply.