Intermittent fasting and not eating the foods TFA mentions is precisely not conventional longevity advice.
I am not saying it's bad; eating fewer calories has its benefits. However, the effectiveness of intermittent fasting, especially as portrayed in the media, has been quite overblown, IMHO. I think one of the main sources of this is from a study that suggested longevity improvements in lab mice. Unfortunately, studies involving lab mice, especially those concerning metabolism, translate poorly to humans.