No they didn't.

The first paragraph of that linki is all you need to read.

"A study commissioned by the Centers for Disease Control and Prevention (CDC) — performed by the Institute of Medicine of the National Academies — has found that there is no benefit of reducing salt intake to below 2,300 mg per day"

Translation: A single study did not find that reducing an already reduced salt intake helps...

The fact is: high salt diets have been quite positively proven to increase fluid volumes and blood pressure -- and high blood pressure kills and maims...

In addition, some believe that salt increases and promotes inflammation -- but the science behind that is not as solid.