Everyone is different. The Two Keto Dudes have two dogmas: (1) Show me the science; and (2) Find what works for you.
Myself, I find that keeping salt in the right range is a great help in keeping calcium, magnesium, and potassium balanced, too. But everyone is an individual. If your body needs more potassium than you can get in your food, then you shouldn’t go by what works for me, you should do what works for you and supplement if you have to.
As I believe I’ve mentioned before, my bias is that, in general, a nutritionally adequate diet supplies all the nutrients the human body needs, without supplementation, But I have to admit there are some people who, for whatever reason, find they need supplements even on a diet that supplies what the vast majority of people need. So that’s where dogma (2) comes into play.