This is about as useful as telling someone who's obese to just eat less. Factually yes, it might help them, but practically they're clearly unable to implement it, probably for a plethora of underlying reasons.
Implementing a ketogenic diet is not the same as a caloric restriction diet - it’s an inversion of the macronutrient pyramid - heavy on fat, moderate on protein and low on carbs.
Even if you consume the same calories as in a traditional diet you’ll likely lose weight. Check the https://metabolicmind.org site for more insightful information.
It's not nearly in the same ballpark.
For Millennials in the US, it might be very useful. We grew up with this food pyramid being pushed at us all the time: https://en.wikipedia.org/wiki/Food_pyramid_%28nutrition%29?u...
That's a lot of carbs. Only like 3 years ago did I learn they changed it around 20 years ago to be less carb-centric.