Not saying its right, and I think the criticism was around the fact that it was published without peer review. No one can discredit it because no one knows. It was purely another hypothesis based on the fact that cases of Covid are now thought to have been circulating around China in November, and here maybe a month before the first official case was found. If you are not looking for it you won't find it. And no one in the UK was looking for it until around the end of January.