Just a little something to help clarify the situation
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.
"In fact, healthy carbs like quinoa, sweet potatoes, and oats are essential for your body’s everyday functions. When you aren’t taking in enough healthy carbs, your body starts to break down fats and proteins for energy instead, which aren’t used efficiently."
That is a garbage statement. Carbs are NOT "essential" and Americans eats tons of carbs anyways.
And why the total focus on "reduce cholesterol"? First, anything with a result in TWO DAYS is almost certainly temporary. But why is "reduce cholesterol" considered a great thing to do?
The sweet spot for longevity isn't "LDL below 100" or "Total cholesterol below 200". It is around 190-260:

https://pmc.ncbi.nlm.nih.gov/articles/PMC6367420/