That video is bullshit misinformation. Severe caloric restriction has never been shown to extend lifespan in humans (or any higher primates). It works for small lab animals like mice because they live in safe little cages where there is no risk of traumatic injuries or infectious diseases. A weak human will eventually fall down the stairs and break a hip, and the resulting immobility tends to lead to death within a couple years.

It is simply impossible for a normal height adult man to subsist permanently on 1500 kcal/day while also doing the hard exercise necessary to build and maintain the optimal level of lean muscle tissue. Do the math, the energy balance just doesn't work. It might be barely adequate for a short woman.