DL only provides dinner on a handful of redeyes, mostly those going to JFK, as they always have. What you are seeing is likely accurate.

Most redeyes (i.e. SEA-ATL, SEA-DTW) still do not provide meal service despite advertising that all flights over 1,500 miles will have a fresh full meal service
https://www.delta.com/content/www/en...rst-class.html