The way the “I” in AI is usually used seems to me to imply achieving average or better, so the aim is mediocre & upwards. steve1977 is agreeing with an opinion that results so far are at best “up to average”, maybe not even that, so more like mediocre & downwards. The phrase Artificial Mediocracy does not seem at all unfair in this context.
The opinion that current models can at best achieve average results overall seem logical to me: that are essentially summarizing a large corpus of human output rather than having original thought. While the systems may “notice” links average humans don't due to not being able to process large amounts of data like that, bringing the average quality of their output up, they are similarly likely to latch onto bad common practise/understanding bringing it back down again. Average results are mediocre results, by definition. Not bad, but not outstanding in any way.
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[1] supposedly, there are strong views about IQ being a flawed measure/measure in some quarters