Because the footage is shot on Alexa Mini in 2048 x 1152. I already have a project going with the previous footage that was shot on a Canon C300 (I know, ideally the documentary would have been shot on one and the same camera, long story) in 2K. I set up the project months ago in 2K, so I want to make proxies that are 2048 x 1080.
Also for the sake of due diligence I want to use Resolve to create the proxies, like I did for the previous footage.