The bottom 18% of adults have, by definition, an IQ of 86.2 or less.
While there's ongoing argument about the extent to which that's a selection bias and there's other skills that aren't captured in this metric (and already were well before LLMs demonstrated that it's definitely possible to train for those tests), IQ scores do correlate with the ability to perform across those kinds of skills.
While we can — and, I would argue, should — help raise people up as far as possible, it's not really surprising that the least capable are the least capable.
While there's ongoing argument about the extent to which that's a selection bias and there's other skills that aren't captured in this metric (and already were well before LLMs demonstrated that it's definitely possible to train for those tests), IQ scores do correlate with the ability to perform across those kinds of skills.
While we can — and, I would argue, should — help raise people up as far as possible, it's not really surprising that the least capable are the least capable.