There are a few much more substantive sites with analysis into the genetics and circumstances around the virus, which emerged since the April 2020 which your Nature article cites as its primary source.
Here's a direct debunk of that article: https://harvardtothebighouse.com/2020/03/19/china-owns-natur...
That author has written a more extensive article with much more information around the lab itself: https://harvardtothebighouse.com/2020/01/31/logistical-and-t...
And here is an analysis of RaTG13, the closest relative of SARS-CoV-2, as a "smoking gun":