I buy that for the sodium sensitive but there are a number of feedback loops that have to be considered.
Diabetes does not just have one cause.
As I said before Conn knew over fifty years ago those with an active adrenal tumour producing aldosterone, many times, but not always, had carbohydrate intolerance and diabetes and retained sodium and also lost potassium.
Their main problem is severe hypertension due sodium retension and potassium leakage.
Excess aldosterone messes with the kidneys, heart and every organ system in the body that have adosterone receptors in. It shuts down the process by which potassium improves signalling and instead stuffs the cells with sodium.
This is why if salt in normo tensives is cut too much it is bad because it amplifies the aldosterone the adrenals produce via angiotensin 2. and constricts arteries.
Phinney recognises this in his writings.