I think they referred to it as 1997 just to reference the release date of the SE. I’d be surprised if they did a screening of any SE that isn’t the current one. What’s the point? The only reason would be if they were specifically showing it on film, which seems unlikely. As far as I’m concerned the blu rays aren’t any worse than the 1997 SEs. There are just a few extra changes (some worse than others), but the 97 SEs are already unwatchable for me anyway, so the Vader screaming “No!” is just another nail in the coffin.