First time the Strawhat Crew realized the Pacifista was a robot, they went all out... Luffy went all out upon seeing a Pacifista in Saobody... This is a robot... it would leave one of two reactions:
1) Make Luffy think it's another Pacifista and go all-out at once...
or 2) Attempt to use the 3rd form of Haki and knock out the user before either do anything else...
Both are within his character
Er, well, that kind of settles it if true. Luffy. Doesn't matter how many deus ex buttons there are, if Coop is out cold or if he doesn't have a mech anymore
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We are thought, and reality, and concept, and the unimaginable