We were just at Incheon last month and they denied entry to myself, my wife, and our young son to the business class lounge despite the fact that we had outgoing Asiana boarding passes and a PP membership from Amex Platinum. So this is even more restrictive than the earlier restrictions. We attempted to get into one of the other PP lounges and they would let us in but they were so crowded we decided to just go to a regular restaurant before our flight back to the US.