FYI, an update on this from Delta PR:
Please note change to aircraft configuration effective April 2024: Starting from April 2024, Delta will operate the Auckland – Los Angeles route with its flagship Airbus A350-900 aircraft, featuring Delta One suites, Delta Premium Select, Delta Comfort+, and Main Cabin services. The route will be operated with a different configuration of A350-900 until the end of March 2024, where customers have a choice of three experiences: Delta One, Delta Comfort+ and Main Cabin.