You described the conditions of your own, better, tests. And showed thereby that you have no clue.
We assume that the Kpelle tribesman has been told that his intelligence is being tested, or at least that he knows that the tester is testing him in some way.
You also assume that your Kpelle tribesman is used to thinking in the same way as the researcher. A different outlook on life is far more likely a cultural than an genetic thing ... is IQ supposed to measure cultural effects? And since the Kpelle tribesman's response was logically quite correct from a quite reasonable perspective, clearly he's not so stupid after all.
You're simply assuming away those effects and demanding that the tribesman accept the conditions you set -- IOW, doing exactly what I said you were doing. You're just too arrogant to admit it.
Part of the problem with our world today is that people fear speaking openly about things.
In the spirit of openness, I will openly and frankly state that you're a hypocrite ... every disparaging trait you attribute to the Kpelle tribesman is found in your own posts. Attempts to "inject reason and sense" into your little diatribe is met with a set of self-serving but unjustified assumptions.
You, sir, are worth no more of my time. Have a nice life.