I think the dangers of a high sodium diet are pretty well documented, especially in the west where they have very high obesity rates. I would take Dr. DiNicolantonio's advice with a "grain of salt" haha
Some of the most reputable organizations in medicine have documented the dangers of an high sodium diet.
https://www.hsph.harvard.edu/nutritionsource/salt-and-sodium...
https://www.cdc.gov/salt/pdfs/children_sodium.pdf
There are still some people that believe that smoking doesn't cause cancer after decades of research. In the end you are free to believe as you wish. Godspeed