Jim, if I'm reading you correctly, then I disagree with you for the reasons set forth in post #10. I can't follow this logic at all, I'm afraid:
It seems to me that if I can find even one person living in central america, south america, or anyplace else on the planet, then I have "falsified" the claim being made.
What am I missing? Where has my thinking "gone wrong?"
Allow me? You are missing the word "no" meaning "none". As soon as you find just one human out there, you have falsified the statement. And "only". When you say humans exist "only" in NA, you then have to search every inch of the planet. Since that is pretty much impossible to do (to say nothing of it including the whole universe), you cannot falsify the statement.
It is confusing, I know. It stops me every time I read the word "falsifiable" which seems to say just the opposite. But, as Jim said, in this case, "falsifiable" does not mean true. It means you can or cannot prove something. We could wish that whoever came up with that word had found another? "If wishes were horses."