Those scientists in that academic paper should have their credentials removed.
China has much more business contacts with its neighbor countries like Singapore, Thailand, Malaysia, and other SEA countries not to mention Hong Kong, Taiwan, Korea, Japan.
Why was the outbreak in these countries/areas so small literally in the hundreds and in some of these countries the number of cases coming back down to almost zero in the first wave of the outbreak?
These countries only got badly hit by the second waves and further waves of the virus variants that are solely the result of the incompetency of the governments in Europe/Americas/India in handling and containing the outbreak.