Earlier quoted context omitted.
Using an example where an outcome (weight gain) is completely driven by an individual’s (in)action (consuming more energy than expending) is probably not the best argument for opposing a “try harder” approach to living. Yes it’s never been easier to eat like shit and have hobbies that require no movement, but the opposite is also true.
A single outcome in over a single point in time, you mean. It doesn’t address the structural issues, such as cost and availability of healthy foods, that contribute to the need to lose weight in the first place.
If we are talking about weight loss (which we are) “healthy” foods are not a requirement, a calorie deficit is.