This is no way exonerates the Wuhan government from possible culpability—indeed government officials did deliberately suppress information—but this investigative opinion doesn’t pass scientific muster. Misinformation.
Smallpox is also naturally originating virus. That doesn't prohibit it from leaking from a lab.
I’m a bioscientist. It’s frustrating to respond with evidence and in good faith, and be downvoted by those who simply disagree. But sadly it appears that the loudest voice prevails over reason.
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":