Thank you Elliott for the thought-provoking response!
I agree with all you said. "A human mind is just as incapable of inferring tacit or pragmatic meaning if it is deprived of the specific tacit or pragmatic meaning required for the particular case." This sentence in particular is very important for this discussion.
My point is that AI doesn't have the means to access the tacit knowledge humans do. A person from an Amazonian tribe couldn't talk about theft or property, that's true. Each cultural tribe has its specific pragmatic reality that they share between them and not with outsiders. But here's the nuance that I tried to convey: Every human, regardless of the cultural differences, shares a common pool of fundamental realities that AIs don't share. AIs belong to a tribe that doesn't overlap with ours.
Communication is based on shared realities. You can communicate better with someone from your country, or with someone with the same beliefs and values, and so on. It's a matter of degree and the degree to which we share reality with AI is very low.
I never meant AI couldn't have their own pragmatic reality of the world and communicate in their own alien language with each other. But the pragmatics humans share are largely out of reach for AI, unless they left their world and enter ours.
What do you think? :)