You're confusing knowledge with intelligence, and, yes, most people can learn a job. Also, 99.99% of jobs do not require much intelligence.

I write for a living. I look at the topics that people want to read, and I write about that. People wanted to read about how they know if someone is super intelligent, so I wrote about that. I was correct in my conclusion - so far this article has had more than 105,000 views.

I write to get paid, and if one wants to get paid, one writes what people want to read about. Rule number one of being an earning writer.

You don't require super intelligence to learn anything at school. There is nothing at school that requires high IQ. In fact, there is nothing at Ph.D level that requires super intellect.

Super intellect is required when one wants to solve the kind of problems on earth that nobody has been able to solve previously.

Getting someone to learn something has nothing to do with high IQ. And one cannot fail an IQ test. It just reveals one capacity to solve problems.

Anyway, I think that concludes your question. Have a good life.