Feeling energized, satisfied, full but not stuffed. That is what they mean. For people who have not developed healthy eating habits they may have never experienced those types of feelings after eating.

Those foods won't make you feel good unless you enjoy shitting yourself into a coma.

Everyone needs calories, if you don't get them from fats and oils, you're left with carbs and sugars, both of which have a higher glycemic index.

So yes, it does mean fats are good, because you need energy to live. If you want to tell me there's some other form of energy that you know about that's better than any of those three, please let me know.

Until then, perhaps you could show me the science that proves how bad fats supposedly are.

Every one needs calories. Avoiding fats and oils means you turn to carbohydrates and sugars, both of which have a higher glycemic index.

There's a reason the US has demonised fat for decades and over those same decades the obesity epidemic has only gotten worse.

Also, the calories in; calories out approach is a myth and probably not good for you long term:

https://www.sydney.edu.au/news-opinion/news/2023/07/05/its-time-to-bust-the-calories-in-calories-out-weight-loss-myth.html

Bottom line

The “calories in, calories out” formula for weight loss success is a myth because it oversimplifies the complex process of calculating energy intake and expenditure. More importantly, it fails to consider the mechanisms our bodies trigger to counteract a reduction in energy intake.

So while you may achieve short-term weight loss following the formula, you’ll likely regain it.

What’s more, calorie counting can do more harm than good, taking the pleasure out of eating and contributing to developing an unhealthy relationship with food. That can make it even harder to achieve and maintain a healthy weight.

For long term weight loss, it’s important to follow evidence-based programs from health-care professionals and make gradual changes to your lifestyle to ensure you form habits that last a lifetime.