I doubt many here have the ability to criticize Langan because he is not at all easy to comprehend. Good luck.
IQ can be improved through training. Ditto scores on exams. Tutoring can help improve scores.
Interestingly, I would say that almost all patents for new ideas re gym equipment have originated in America and Europe and countries derived from those places. I know of no gym equipment patents from the Middle East, Asia, South America, or Africa. This might mean that those places aren't interested in physiques and associated training.
I wonder what sort of test Langan would construct to test super high intelligence? There was a psychologist in England who did a factor analysis on intelligence and came up with at least 120 different kinds of intelligence. Clearly some of those kinds of intelligence have never been tested for. If you take a look at the IQ tests for the superintelligent you will see that you cannot easily guess the answers because they don't have multiple choice questions. You have to fill in the answer yourself. There is no way at all that dunces could score high on those difficult tests. I would bet they would be unable to get even one answer correct.
Those special tests do not have a time limit. When Langan was supposed to be tested under controlled conditions how long did he take to complete those tests? Surely no one would supervise someone for a month or even a week! Now if someone can complete one of those extremely difficult tests in a matter of hours then he has a brain that we can hardly comprehend. If those individuals post their thoughts it may be just as difficult to comprehend what they are saying. If that is so we won't be able to know if what they are saying makes sense or not. That seems to be what happens when you try to read Langan's work.