What about Xanax or medication. Hypothetically ignoring the ill effects of the drugs themselves will chemical stress relief have the same anti-aging benefits?
If you believe that HRV is inversely correlated with stress then Xanax has the opposite of your intended effect.
They are not talking about stress in the "mental health" setting, rather the metabolic one.
In most cases they are the same thing.
Most of it is oxygen. Oxygen is highly reactive so the same thing that makes it a good as source of fuel, also makes it poisonous. It is a double-edged sword.