This is how all dieting works. Specific techniques in isolation rarely have a huge impact, but that doesn't actually matter.

Any framework that causes an overwieght person to genuinely pay attention to what they eat will have a weight loss impact, because all you have to do to lose weight is eat less. The wide variety of dieting techniques are a good thing because it maximizes the likelihood that any individual will find a framework that induces them to pay attention to their eating habits.

I've gone through many weight loss cycles using various techniques including OMAD. Eating once a day changes your relationship with food, and disrupting that relationship is a thousand times more important than whatever obscure biological processes the fitness gurus suppose are in play.