Oh, I don’t know. They mention in the article they were getting their “look” 90% in camera and their colorist/grader was creating the last 10% in post.
90% ain’t bad.
Their earlier film “Let Me In” was visually impressive on a modest production scale.
Talented and tenacious young film makers are doing amazing work with modest gear.
Source: help run a film fest, seeing a handful of micro budget films making high end visuals happen.