Originally Posted by
Fly_Delta_Jets
Incorrect, as long as you have either a Sky Club membership (can be flying any airline I believe) or membership through another means (Amex Plat/DL Reserve) and are also flying Delta then you'll have access with or without a seat assignment. The only lounges that won't let you in without a seat assignment in my experience are Centurion Lounges.
I think the point
zhickman was trying to make was that OP would likely get an actual seat assignment at check-in, not a seat request card, even on an E fare, and so it the original question wouldn't matter.