I think people read too much into IQ tests. IQ tests will test what sub skills you have and don’t have currently. They do not test your innate abilities and one can improve their sub skills within your lifetime.
Moreover, people assume having a higher IQ means you are definitely smarter than someone with a lower IQ. However, IQ does not measure how much rigorous thinking you have done in your lifetime — a metric that would better score how many useful insights you have gathered in your life — nor does it measure what domain-knowledge connections you have in your brain that are useful. It just measures a subset of cognitive subskills that makes it easier for one to pickup ideas: not that you actually have used them for such purposes nor that you have used these subskills to their full abilities.
Additionally, these subskills can also be a hindrance to your learning. Neurodivergent people — who typically perform worse on IQ tests — can often be forced to learn MORE effective systems and will outperform high-IQ neuro-typical people’s performances as they were forced to adapt around their subskill insufficiencies: analogous to a blind person learning how to echo-locate and can see in 360 degrees with their clicks bouncing off walls and objects (something seeing people typically can not do).
IQ tests are misleading because people believe they measure a person’s life-long cognitive ceiling and that it tests more than it actually does. IQ does not test intelligence nor learning abilities. It tests a subset of subskills that are the most common tools that most people use to learn. The test does not measure all the possible learning tools one can use to learn. IQ does not test how much one’s organization and scheduling abilities can help overcome IQ insufficiencies. IQ does not test one’s ability to pick which learning tactics is best to use when studying a given subject. IQ does not test how well one can update their priors — which is probably one of the most important items when measuring how intelligent/informed a person will become in their lifetime. IQ also does not test how well a person can reframe an issue/discussion to be more constructive and accurate.
IQ measures much less about intelligence than the complete set of subskills that are relevant to a person’s cognitive ceiling. IQ measures enough to draw a regression line on a graph between it and perceived intelligence. Any stronger statement one could make about IQ’s implication on measuring intelligence is simply conjecture.