I agree that quote is there (and have read the surrounding context), but it doesn't seem to me that it actually says that DuckDuckBot results aren't used in any non-Instant Answer search result, which I think is a distinction. They're very clearly synthesizing results from multiple sources, including many from Bing, but neither that page nor the DuckDuckBot-specific page seem to directly exclude the use of their internally-crawled results in the non-Instant Answers search results. Did I perhaps miss something?

You're right but at the same time they say that they source their "traditional links in the search results" from "multiple partners", which to me seems to imply that it's from partners only and not their own crawler.

Try searching for something random like "woxioai" on DDG and you will see that the search results are identical to Bing (albeit a slightly different order but I presume they do some internal sorting at least), while the search results are completely different on Google.