This study sought to assess the effects of a salt substitute (62.5% NaCl, 25% KCl, and 12.5% flavorings) on incidence of hypertension and hypotension among older adults with normal blood pressure.
https://www.sciencedirect.com/science/article/abs/pii/S0735109723082633?via%3Dihub
That’s fair. I also don’t know the extent of their use of the substitute, whether it was a total replacement or just basic at-home cooking, or even a replacement for added salt.
Depending on the proportion replaced, 1/3 could be a pretty big change. But I agree that it would be more effective to reduce it at the source.