Well that's the trick. That the systems we use, as a proxy, to measure intellinnce in people are actually fairly easy to immitate.

But let's be clear these were always, and are, bad measures of intelligence. You cannot test a dolphin this way. And its easy to cheat on tests either thru recall , wrote-learning, etc. and IQ tests haev very poor individual test-retest reliability.

In humans there's a convenient correlation that verbal articulation in text is a strong but weak correlate of intelligence. Its "Good enough" for allocating meat bodies to our various institutions. But if you've met many well-tested people you'll realise how, in practice, terrible this measuring approach is. The world we inhabit is filled with misclassified "intellects" who perform well under text-based rubrics. Add LLMs to that heap, the cheater par execellence.