> under ideal conditions.
I interpreted the claim as being under non-ideal conditions (which is fair, frankly—it's well-known that the visual and sound quality is better at the beginning of a run than at the end, and film quality doesn't matter if your local theater doesn't ensure it's preserved as best it can be).
Plus, I saw a film viewing of Sinners this past weekend (quite a fun movie, highly recommend it) and some visual artifacts were very noticeable—it was regular enough I figured there was a slice of the film roll that got damaged somehow.