Yeah i saw that after posting. Housemarque claim it's 1440p, then checkerboard 4K, but thats still better than Elite. Ditto 60fps. Ditto at least using the RT for calculations - again more than Elite.
Recently someone was pointing out how PC gamers laugh at consoles using checkerboard 4K, while saying how great DLSS is in their next sentance without any hypocrisy. It's all stuff to make a game look better.
Specifically for Returnal, given it's a fast moving game with lots of bullets flying about, DF themselves point out it's the right decision for this game to cut/construct resolution for stable framerate.
DF video for anyone interested (resolution discussion at about 15:36):
Source: https://youtu.be/8gXNem1Vyz4?t=936