This is the doctrine known in restricted field manuals as Officially, it doesn't exist. Unofficially, it is the difference between a metal coffin and a legendary kill ratio.
The "-KNOCKOUT- CLASSIFIED" files highlight a vital truth about modern combat: survival is the ultimate form of lethality. The tank is not dead, but the old way of employing it certainly is.
Based on the components of the title, "The Reverse Art of Tank Warfare" likely explores one of the following concepts: 1. Counter-Armor and Asymmetric Tactics
In a "Classified" context, this might refer to the psychological impact of seeing an "unstoppable" force destroyed.
If you want to explore specific aspects of this doctrine further, let me know if I should focus on: