We just got back from the RPR and NO, they don't open the club lounge early enough for you to eat in the lounge before early entry to WWOHP.
We did, however, go and do the early entry (7am) and then made it back to the hotel in time to eat breakfast before they closed. I had grabbed a few of the oatmeal raisin granola bars that they had out for the afternoon snack the day before. We snacked on those while waiting for the early opening along with the coffee/tea we made in the room using the Keurig machine.
Maggie