I’m not patronising you, I am pointing you to well established research on the difficult issue of how to achieve successful weight loss
in obese people, which you seem to be unaware of.
You said: "weight loss itself comes primarily from diet adjustment", which is untrue. Weight loss comes from creating a calorie deficit.
Weight loss comes primarily from diet adjustment because that is the only effective way to create a calorie deficit in those who are very overweight, exercise, while generally good for you, and helpful for weight loss maintenance is not enough to do it.
It would be great if obese people who need to loose, say 10 stone, could achieve that loss in the same way a someone who needs to loose 10 pounds can, but sadly it does not work like that, for a multitude of reasons.