He is like that in interviews, but it's worth noting that a lot of care is put into making great digital versions of his movies too. I'm not familiar with how involved he is in that process, but I would hazard a guess he's pretty involved.

The Oppenheimer site mentions this:

The Digital Cinema presentation of OPPENHEIMER has been created from 8k scans of the photochemically color-graded film elements, scaled to 4K, fine-tuned in the digital realm to maximize the color and contrast attributes of digital projectors, and dust-busted to achieve the cleanest and most stable image presentation possible. The film was finished in 4k for the highest digital resolution currently available.

https://www.oppenheimermovie.com/tickets/formats/