Money quoute right here: "We also of course have more traditional links in the search results, which we also source from a variety of partners, including Verizon Media (formerly Yahoo) and Bing."
SO and the other 400 sources are only used for instant boxes and other widgets. The real organic search results are all from Bing.
Full quote
> In fact, DuckDuckGo gets its results from over four hundred sources. These include hundreds of vertical sources delivering niche Instant Answers, DuckDuckBot (our crawler) and crowd-sourced sites (like Wikipedia, stored in our answer indexes). We also of course have more traditional links in the search results, which we also source from a variety of partners, including Verizon Media (formerly Yahoo) and Bing.
I'm not sure where you're getting
> The real organic search results are all from Bing.
That paragraph __DOES NOT__ say that
[0] https://help.duckduckgo.com/results/sources/