> They don't even understand the question. So, of course, they are going to suck at answering them.

I agree, but would also say that you should be capable of learning to understand those questions. For example, If you can't speak English, you'll be bad at reading books in English. If you were never taught math, you'll be bad at math. Similarly, If you never learned to reason you'll be bad at solving logic puzzles. It's almost tautological.

However, if a person is incapable of learning to do one of those things, despite the majority of the world being fully capable of doing it, they probably have a cognitive deficit.

> And ultimately that is all IQ testing measures.. your ability to take tests.

I disagree. I think it measures how well you've learned to reason, though I do agree that reasoning is a learned skill for most people.