I think that's because two of the most important problems with food are quality and quantity that people eat. I'm general terms we eata lot of bad food, so if you have the same meal (so same quality) eating less (or only what your body needs and no more) that should be healthier.

I think I get your point though and eating well is a lot more that eating good food in adequate portions, and I agree, but for the general population over eating and junk food are the worst problems right now imho.

Is there even any evidence that eating less this way leads to smaller nutrient absorption by the body? This article does not seem to have any.

Relatively speaking, eating healthy is much easier than eating less. Anybody with enough will can eat healthy -it's quite sustainable. However, Over long periods of time, Eating fewer calories is a much larger challenge, that's why satiety research is of such enormous importance. For overweight people, There are many biological forces that force people to eat more than they need.