In this video, Dr. Attia talks a lot about energy balance and implies the only reason Keto would work is that you are cutting back on certain food groups which he interprets as eating fewer calories. That is, any diet would work that limits certain food groups.

Isn’t there evidence that carbohydrates spike insulin thereby promoting fat storage, and preventing fat burning? Wouldn’t this be one of the accepted "biochemistry phenomenons" he is trying to teach us?

https://www.youtube.com/watch?v=b_d-drdcfJo&t=446s
(I have the link advanced to the relevant part)