Unlikely. It's a discount theater. They probably would not use kosher salt as that would be more expensive. Alternative: ask them to make a fresh batch unsalted because of dietary restrictions. You can add your own salt.
not sure
Just bring in your own popcorn if you don’t like how it’s prepared....😢 sad people
https://www.healthline.com/nutrition/different-types-of-salt#what-is-salt
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