I’m curious about this as well. Did they not officially state at one point that they were showing the '97 prints? I wouldn’t put it past someone not nearly as knowledgeable about the various versions to have simply jumped to the conclusion of it being the '97 versions (not 2011) and also thinking “prints” (when it’s actually dcp).
Still, IIRC they said “ultra rare screenings of the '97 35mm prints,” which seemed to spell things out in no uncertain terms.