Just following up on the AFF gazette article today where it states:
The Qantas website also continues to list “lounge access before or after your flight” as a published benefit of Platinum and Platinum One status, with no caveats or disclaimers.
Eligibility for any benefits will always need to be read in conjunction with the terms and conditions. Part 10 of the Qantas Club terms and conditions state:
10.6 Qantas Club staff have the discretion to refuse entry to any Member or guest at any time if, in their reasonable opinion, the Member has not or will not comply with these Terms and Conditions or the Club Rules, or the refusal is necessary or convenient for the orderly operation of the lounge or other facilities or the safety or comfort of other Members, their guests and staff.
That's fairly broad and could potentially cover this current restriction. (i agree if the benefit is to be taken away completely then QF should be giving the proper notice as required under the program rules.)