[yetanother12345]

> This could instead be explained by having a IQ

I respectfully disagree. Reasoning and memory is not the same.

If you happen to actually become aquaintaned to more than one of this type of people during your lifetime you will (maybe) note that their abilities in memory do not need to be correlated to their abilities in reasoning. I have personally met more than a handful with extraordinary memory skills, and while some would probably be able to achieve a "high IQ" score others would certainly not. The latest I've met did not even pass public school reading tests [0].

As an aside, obtaining a high IQ score is done using a standardized procedure and as such it is only a measure of one very specific class of reasoning skills, not "general intelligence" per se

[0] First hand, he told me

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Edit to add this: Here I specifically relate to the memory-equilibrists due to the parent comment emhasizing one such specimen. Others in the savant spectrum (it is a spectrum) do have abilities that would correlate better with the measure known as "IQ".