"If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle."
- Sun Tzu
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The Imperium was was researching the technology of the Mind Flayers or even Orkish one to devise better methods of countering their attacks. Even though the Orkish Tek was basically one huge impossibility to work, as nobody could understand clearly.
However, the theory that was accepted by the majority of scholars was that the Orkish Tek was working simply because the Orks willed it to work. Their collective psychic consciousness was making it to work, like a miracle.
If enough Orks believed that rockets painted red would deliver an even bigger explosion than it should be, then if enough Orks believed in this, then it would happen.