It didn't sound plausible tbh since they add anti-caking agents and sugar seems like a pro-caking agent. I even googled salt additives (to keep the search neutral) and it didn't turn up sugar anywhere.
Yeah, no. I have no idea what that person is referencing. I've had all the available salts around me and I've literally never seen sugar in salt. That would be insane. They do use an anti caking agent sometimes though, but that's more like sand
