This is not a scientific study. It has not been published in a peer reviewed journal. You are intellectually dishonest and misrepresenting what a study actually is.
"Great exodus" implies something extraordinarily large. The truth is the opposite, however; the "Chinese exodus" is actually disproportionately small.
This is an example of a quasi observational study. Again you don't have any information or proof discrediting that the writer could have taken information from a mixed qualitative-quantitative data sampling.
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