Seems like this effect can be reproduced by intermittent fasting or a keto diet.
What's special about HVMN Ketone is that you can get into ketosis with just a drink. And it lets you maintain carb levels at the same time, unlike keto diet & IF, which is a big plus for the sports performance gains.
Can I eat carbs every day but drink this and stay in ketosis? That seems really unlikely.
Also, if I remember correctly, ketone esters were originally developed for use in rebreather SCUBA diving. The concentration of oxygen makes seizures much more likely. Since ketogenic diets are useful for preventing seizures, the military wanted a "ketogenic diet in a pill".