When you are overweight, it is not a case of just eating less. Eating less has very different physical and psychological effects for someone who is overweight than for someone who is not.
If you are interested in learning something about this, you can check out the setpoint theory of body weight. In short, the body has a setpoint for which weight it should be. If you are overweight, this setpoint is at a higher weight than if you are not. If your weight gets below the setpoint, your metabolism will slow down and your appetite will go up and the body starts to try and do everything to go back to this higher weight. That is why most people are not able to lose more than 10% of their weight in the long term. Often, when they gain the weight back, they gain back even more than they lost and the setpoint might even go up further. It is a neverending struggle for most people. Medication like Ozempic affect this mechanism so it becomes possible to lose weight.
If you want, you can find a lot of scientific papers about this. There is quite a lot of research on this and the setpoint theory is well accepted within the medical field specialised in dealing with weight problems, I believe.
In addition, Ozempic is not only a fat loss medicine. It is also used by people with diabetes to lower their glucose.
No, it is not junk science. Research about it is published in many serious scientific journals. Just check out Scopus or something. You cannot say that it is junk science just because you do not like the results.
You also seem to not understand it. It does not say that you can escape the law of physics. It also does not say that in my explanation. It says that you energy expenditure goes down if you get below the setpoint. So, eating less becomes less effective. At the same time, you appetite will go up. This makes it very difficult to maintain the weight loss and this is why many people fail to keep the weight off in the long term.
Criticism of any research is possible, of course. However, just saying it is junk and misrepresenting what the theory actually says are not good arguments.
If you disagree, then what is your explanation of why most obese people tend to not keep more than 10% weight off over time without medication or surgery? What scientific evidence is there for that? I would be very interested in hearing about alternative research on this topic.