https://www.sciencealert.com/was-cor...lert-Latest%29
This article echoes GGG sentiment that the March 2019 test is likely a false positive.
Some key notes:
-they were screening for 3 genes but only tested positive for one and only after 39 cycles of amplification.
-no spike in respiratory diseases locally were reported during that period
-this result suggests the virus was present in the population in March at high enough frequency to be detected but then at not high enough levels to be detected for the next nine months. Doesn't seem plausible for Covid as we know it.
My guess is the sample was contaminated or some other error. Even if they can reproduce the result I think its dubious at best without additional supporting evidence.