I can’t say that everything has been fixed. People using Alt F4 have apparently been getting some gold but it looks incredibly unreliable and no ones seem to be able to replicate it after having done it once. The other method of lagging out the AH to dupe items has been exposed and hotfixed to mitigate damage.
The other gold dupe about the item being posted in chat is a large troll and I don’t believe that would work, since no one has proved it yet. At this point, if there is another gold dupe, it’s not known yet and being well guarded.