The article doesn't even use the word IQ. The didn't use IQ test.
If you look at the results of the world memory championships where people memorise a deck of cards in under a minute these day (and they leared to do that skill) it is pretty clear that you can significantly improve memory.
The question they tried to answer was whether you can train a mental ability X and improve other abilities Y through the training of X.
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what if someone doesn't think logically anyway? what if they think abstractly...,
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IQ test reward abstract thinking but don't reward creativity and thinking outside the box.