This assertion that the Swiss lab proves that the nerve agent used on the spy and his daughter did not come from Russian appears to be false. To verify I went to the Swiss Spiezlab's twitter page.
https:// twitter.com/search?q=SpiezLab
Clicked on the article that Spiez lab suggested then at the top of the page of the article a tab allows you to translate the page into English. Though the English isn't perfect you are able to see that though they can't say definitely that it is from Russia they do state that Russia is the only one known to have created that product.