Based on skimming that it looks like low carb diet can be as effective or more effective than low fat diet at reducing triglycerides, blood glucose and other metabolic markers, may not be as good at reducing LDL as low fat, and may pose additional safety risks compared to low fat. Some articles say no difference in blood glucose between low fat and high carb. Some say Mediterranean diet is better at glucose control than low carb diet.

Of the studies that show low carb has better a1c reduction than low fat, the reduction is ~0.5%. Clinically meaningful but certainly not a reversal of diabetes

So low carb may be better than low fat diet at reducing blood glucsoe. However that isn't conclusive. Also the Mediterranean diet may be better than both at improving glucose. And some evidence suggests low carb is worse than low fat for LDL levels and heart disease

However i didn't see any studies that showed reversal of diabetes, cancer or autism or any other disease. I don't doubt that a low carb diet can help people lose weight or better control their diabetes. I do doubt whether it can "reverse diabetes at scale", cure cancer etc. using preliminary findings that low carb is better than other diets at a1c reduction to claim this can "reverse diabetes at scale" seems not far from snake oil to me