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That doesn't fit at all for instance the history of Japanese in Brazil, the lower classes came to Brazil in 1920s and they are now one of the most successful groups in the country... besides that, just look at history of China, Japan... without any influence from outsiders they built very organized civilisations and nowadays they perform very well in STEM fields and they altogether have a considerable amount of Nobel prizes.
Doubt all you want then.
Mind you that from all four the Chinese are basically the only group that kept more or less the same genetical group, the other ones were assimilated.
"Are Asians more intelligent?"
They are slightly above Western Europeans I would say.
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