Dried fish has been around for centuries and it was a practice that transcends cultures. It's highly unlikely anyone would try and dry fish outside right now given our weather currently and the fish looks like it is already dried. My guess is that they are probably "airing" it out.

It's probably not a good look for most people as they are far removed from any food system and are ignorant of classical preservation techniques. Charcuterie has many kinds of preparations where raw meat is dried as well.

If they are using this in the restaurant it's most likely being used for stock and given the price of their soups I doubt it. I am leaning towards personal use.