The thing about these salt substitutes is that more studies are needed, just because there's few of them. The evidence is very promising though, and people switching to these substitutes has been shown to distinctly lower blood pressure, and appears to make a difference for all-cause mortality.

Experts and industry leaders are looking into incorporating added potassium salt into their foods, so it's probably only a matter of time before virtually everything that everyone eats will have lower sodium and higher potassium.

https://www.ahajournals.org/doi/10.1161/HYPERTENSIONAHA.123.21343