To me, that quote still reads as pretty vague and not 100% "things work because Orks".
I also stick to the notion that all Codexes are written from an Imperial POV (something that was suggested to me by a GW staffer once). All of the Imperial Codexes are puff pieces about the faction and while non-Imperial Codexes contain basic info they're still clearly biased. Craftworlders are haughty self-serving prats, the Orks are a violent menace, CSM are evil monsters.
The biggest supporting point of this notion for me was the 8th Ed CSM Codex naming Horus as the first Traitor Primarch (not first among or greatest to fall, first), which isn't true since Lorgar orchestrated Horus's fall in the first place but according to the Imperium, Lorgar turned Traitor after Horus did.
Plus, have we ever seen evidence of T'au or Aeldari attempts to use/dissect Ork weaponry? I can't recall anything like that, which means the only perspective on Ork weaponry not working for non-Orks is an Imperial one.
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