The shoot was only 65 days, and then nearly two years of post production.
With that level of work, I would say most if not all of it went through a DI.

I see what you are getting at, however, we still need to scan at at least 4K as we aren’t just transferring a digital file directly from their servers, we are scanning a print.

If through some miracle the ‘2K grid’ that the print ‘originally’ was created from happened to perfectly line up with every CCD pixel on our scanner, well, umm… you see what I mean.
If we scanned at 2K we would end up reducing the resolution of the print to way below 2K as the ‘pixels’ as laid out on the film could not possibly line up perfectly with the pixels on our scanner CCD.

If that seems confusing, I’ll draw up a graphic to show what I mean.