Keto is one of many strategies that people use to comply to consuming the right number of calories.
The high fat, low carbs position is that excessive carbs create an endocrine disorder where the body is storing incoming calories in fatty tissue, thus making it unavailable as energy. This causes the body to respond in two ways: 1) eating more food, and 2) expending less energy. The key is that the energy balance equation has two variables, not one. There is the amount of calories that are consumed and then the amount of calories that are expended.
So, it is correct to say that a ketogenic diet, when compared to another diet consisting of the same number of calories, cannot lead to more weight loss as a result of calorie intake. But the ketogenic diet could, in theory, produce comparatively more weight loss by fixing the endocrine system disorder and allowing calories stored in fatty tissue to be used as energy. This would manifest itself as the person on the ketogenic diet being more active and feeling like they have more energy.
I'm not saying that this is, in fact, what is happening, just that it is a plausible theory. In my opinion, the theoretical underpinnings of the low carb, high fat hypothesis seem more plausible to me, but neither side can actually claim that the science supports them, because the studies that need to be done (randomized controlled trials of various types of diets), have simply never been done.