No Sodium Seltzer?

Why on earth does VINTAGE brand Seltzer say "No Sodium" when clearly - on the label is says that there is 5mg of sodium? How is this OK?

I LOVE me some seltzer - of all flavors. And I'm totally OK with sodium in my life... I have no problem with there being sodium in the seltzer - but why, oh why - would they say "Sodium Free" right on the label on top of the nutrition Facts that clearly say otherwise???

I'm baffled...