Are you really trying to say that promoting a nutritious diet supported by physical activity doesn't work for "most people"? You call that engaged advocacy?
What he claimed is true and backed by multiple studies. Doing a healthy dose of physical activity with a healthy diet can only be beneficial, no downside whatsoever. It's quite underrated I guess. Too many humans wish for a magic pill, they delude themselves into thinking that it must be better than healthy living habits, since it's more modern. People are looking for the lazy fix.