The subject of the researches similar to this research was already reported almost 2 months ago. Why this scientist is still researching it. This game of China-blame-U.S. and U.S-blame-China started from China blaming U.S. at first (around mid Feb) by using this kind of research, saying origin of coronavirus is from U.S. last fall. U.S. just didn't know it because they didn't test it. This conspiracy theory dominated in Chinese social media including Taiwan since mid-Feb. See this Taiwan pop-science show on mid-Feb in which the pathological scientist (with eye glasses) said the origin of covid-19 is from U.S. His reason is exactly what your linked research says.