Maybe you know something that I don't know
Over training, is a form of stress in which you exceed you body's recuperative abiity. Just being alive requires metabolic support in which there is a cost. A cost in energy and what is loosely called "wear and tear". Even if you do no training at all, in fact, even if you just sit around all day, you are still using energy and cellular resources that cause varying degrees of "wear and tear." Unlike machines, the human body has the ability to regenerate by a process that takes effect when we sleep. Whether you are working construction all day, lifting weights, or just lying around the house you will still need sleep and "down time".
How much recovery you need depends on the level of stress and breakdown that your body has experienced. There are occasions where the stress and damage done to the body is so great, i.e., car crash, being set on fire, working in a concentration camp, not having sufficient fuel/nutrients/water... that you never recover and you die.
Your body has natural processes that protect you from doing this to yourself. You pass out during extreme exertion rather than push yourself until your body shuts down, i.e. die. You can't stay awake forever (your body forcing you to sleep and recover).
So no matter how hard you train, there is a given, which varies from individual to individual, amount of time in which your body has fully recovered. Otherwise that would imply that you can never recover from a hard HIT workout forever.
I would surmise that Tom Platz has experience some of the hardest most intense workout a human being has ever subjected himself to. I'm pretty sure he has recovered by now and his energy and metabolic equilibrium are at normal levels