I feel totally sympathetic to your story, and it sounds like they were not very nice about it, but it's true - the liquor licenses mean he shouldn't be in there because he can go up to the self serve liquor and get whatever he wants, no ID required. If there was a liquor license sting, there would legitimately be a huge fine and they would lose their license, an absolute disaster.

Also I don't know about Qantas, but with the Air NZ Koru lounge pass you can't use it to get someone else in, even your own flesh and blood unless you are there and they are a guest.