You point to a promotional mumbo jumbo for oats (from a website selling oatmeal, no less!!!) that explains that oat is healthy because... oat is “healthy” carbs.
That makes NO sense.
Oatmeal leads to diabetes like eating eggs leads to high cholesterol, both have really healthy vitamins and nutrients, but if you eat multiple dozens of eggs or eat boxes of oatmeal at every meal it will lead to problems.
Both are great parts of a healthy diet, but with most things over doing it can be bad....