It does not contradict, no. I can lose weight eating moderately but you may not. You may need to eat bordering on starvation to lose weight, which in my book is not "moderate".

Basically, my point is, some people have to suffer more to lose weight. But all people will lose weight regardless if they stop eating, because physics.

This tired tendency to reduce weight control to physics is patently counterproductive. It's about as helpful as pointing out to a smoker that they'd quit smoking regardless of how addicted they are, if only they could smoke progressively fewer cigarettes, because logic and definitions. Technically correct, but misses the point entirely.