Salt being unhealthy is, for the majority of people, a myth in much the same way that MSG being unhealthy is a myth.

Studies show that having too little salt in your diet is more likely to cause cardiac events than having the recommended or slightly to moderately above the daily recommended amount is. Having an extremely high sodium intake is similarly found to have poor cardiac implications, but that is at very high levels which most people do not hit. There is a subset of the population who are known as being "salt-sensitive" who need to limit their sodium intake in order to keep blood pressure at a healthy level, but they are the minority. Similarly, there is a subset of the population that needs a higher level of sodium intake due to their own health conditions (such as POTS or cystic fibrosis).

I don't have those studies immediately on hand, but I tend to read them when they come up because I have both POTS and cystic fibrosis so this myth becomes very tiresome. The below site sources.

https://immieats.com/the-sodium-myth-debunked-why-salt-is-not-the-enemy/

https://www.scientificamerican.com/article/its-time-to-end-the-war-on-salt/