Thank you for your reply. So, if I understand you correctly, my Premium Select boarding pass along with gold/eliteplus status will give me access to the lounge. When I first traveled the A350 from DTW to Narita last November the check-in agent told me premium select gave me access to the lounge. And this has been true for all three trips I have taken on this route. Apparently, it is my status with Delta along with Premium Select fare that allows access.