It's not a straw man, my point was that diet is not monitored in most of these studies as was noted in the study you linked and even when diet is monitored, it is still not equal because fiber is used to supplement the diets of the animals eating the calorie restricted diet, therefore the diets are not equal in nutritional value. There's more to a good diet than low amounts of highly processed foods as I noted in a different comment, a low amount of consumed animal products along with a good amount of fiber and adequate consumption of all essential amino acids, proteins, fats, carbs, vitamins and minerals is also needed.

There has not been a study that has established why caloric restriction results in increased health and longevity therefore we can't say that it's not the co-factors associated with caloric restriction (i.e., better diets, intermittent fasting, fasting correlated with circadian rhythms, etc.) that are primarily responsible for the beneficial effects rather than the restriction of calories itself.

My purpose in pointing out blue zone diets was to demonstrate that health and longevity do not require caloric restriction. My point was also to demonstrate that caloric restriction leads to hunger and hunger leads to impaired mood and cognition which has also been well documented in other studies. Caloric restriction has benefits but we can reap those benefits through a good diet, without restricting calories, without going hungry, and without affecting our mood and cognitive abilities.