But the entire article is about the body using metabolic water, not dietary water, to excrete salt. So it wouldn't matter the concentration of the salt in the w

But the entire article is about the body using metabolic water, not dietary water, to excrete salt. So it wouldn't matter the concentration of the salt in the water you intake - your body would burn enough carbohydrates and protein to generate enough water to dilute it. I suppose in a starvation situation you'd be in extreme catabolism and just make everything worse.