The parent commenter must be eating something like canned nuts or some other salted snack. You don't need very much salt to survive so I could imagine that they wouldn't die if they ate some of that on a regular basis.

The idea that salt, the oldest seasoning known to mankind, produced by evaporating seawater, is not "natural" or must be excluded in a plant-based diet is wild.

I don't buy or use any salt.