That doesn't seem plausible. Hard exercise increases oxidative stress and yet we have pretty good evidence that frequent hard exercise is correlated with longer lifespan.
Calorie restriction like the nonsense you're promoting would leave me too weak to do my favorite activities.
Bodybuilders were the first people to start intermittent fasting after the mouse study. The title of the front page of https://leangains.com/ is "Leangains - Birthplace of Intermittent Fasting"
More like resistance training than bodybuilding (bodybuilding is more about aesthetics than strength, although there is a significant linkage). Falls are a leading cause of death and disability in the elderly. Old people who fall and break a hip seldom fully recover, lose mobility, and are often dead within a couple years. Being strong enough to stabilize your joints and catch yourself before hitting the ground is extremely important (although this is difficult to study through randomized controlled trials).
By the way, this is one reason why mouse studies on longevity don't translate well to humans. Lab animals live in safe, flat cages where there's little risk of musculoskeletal injuries. The real world where humans live is far more hazardous.
Calorie restriction like the nonsense you're promoting would leave me too weak to do my favorite activities.