Many Delta Hotels have an elite pantry. Here's what The Points Guy described the concept as back in 2019:

"The Elite Pantry, available 24 hours a day to Platinum elite and higher Marriott Bonvoy members, offers soft drinks, coffee and tea, bottled water; fresh fruit, candies, chips; and breakfast options such as oatmeal, cereal and milk, snack bars and a variety of protein options including yogurt and hard-boiled eggs. In most locations, there's no seating area, and in some locations it's literally pantry-sized, but it gives you many of the same benefits of a club lounge. The Elite Pantry offers more than enough options to scrounge up a continental breakfast, afternoon snack or even something to fend off an attack of the midnight munchies."

Is that what you experienced?